A debt collector says you owe $1,180 to a company you have never dealt with. The caller knows your name and an old address, and insists that paying today will keep the account off your credit file. That combination of pressure and personal details can be unsettling. It still doesn't tell you whether the claim is valid.

Do not pay simply to end the call. But don't throw away official letters or ignore court papers either. The safe middle ground is to get the claim in writing, check the relevant dates and respond to the precise debt being asserted.

During the first call, gather information—not obligations

Ask for the collection company's legal business name, its mailing address, the name of the creditor, and a reference number. You can say that you do not recognize the account and want the required validation information. You don't need to confirm a full Social Security number, a bank account number or a password to an unsolicited caller.

If the caller won't identify the business or demands payment through a gift card or cryptocurrency, end the conversation. Verify any contact details independently before you send money or documents.

Read the validation notice for the clock that matters

Debt collectors covered by federal debt-collection rules generally must provide validation information about the debt. The notice should explain the claimed creditor, amount and how to dispute it. Save the notice and write down when you received it.

Under federal rules described by the CFPB, sending a written dispute within 30 days after receiving the validation notice generally requires the covered collector to pause collection of the disputed amount until it responds with verification. You may still challenge a debt after that window, but the special pause is not assured. Read the actual notice for instructions rather than calculating a deadline from memory.

A short dispute can be enough

I dispute the debt identified in your validation notice, reference [number]. I do not recognize the account and do not believe the debt belongs to me. Please provide verification of the debt and investigate whether you have contacted the wrong person. Please correspond with me in writing at the address listed above.

Send the notice to the verified address or through an accepted written channel, keep a copy and retain proof that it was sent. You do not need to supply unrelated personal records to prove your innocence. If the issue is mistaken identity, concise facts are better than a long account of every debt you've ever paid.

Why the debt might not look familiar

The creditor may use a different brand name from the one you remember; a debt may have been sold; or the account may belong to someone with a similar name. Identity theft is another possibility. Do not assume which explanation fits until you see the details.

If an unfamiliar collection appears on your credit report, get your reports through AnnualCreditReport.com. Dispute inaccurate credit-file entries with the reporting bureau and the company providing the data. If you suspect someone opened accounts using your identity, follow the steps at IdentityTheft.gov. A debt-collector dispute and a credit-report dispute are separate processes; you may need both.

If a lawsuit arrives, the plan changes

Actual court papers require prompt attention. Note the court, case number, the deadline to respond and the specific instructions. A letter disputing the debt with a collector is not a substitute for filing an answer in court. Missing a court deadline can lead to serious consequences even when you believe the claim is mistaken. Consider a consumer-law attorney or legal-aid service in your state.

Be cautious about making small payments or written promises on an old debt before getting advice. Depending on state law and the circumstances, such actions can affect limitations questions. Not every old debt is legally uncollectible, and the rules vary.

What if the collector keeps calling?

Record the date, time, company name and what was said. Covered collectors are restricted from harassment, deception and certain kinds of contact. You can ask the collector to stop contacting you in writing, although that does not cancel a valid debt or eliminate the possibility of a lawsuit. Before making that request, consider whether you still need the company's information to assess the claim.

You can learn more in the CFPB debt-collection resource center, and the CFPB explains the effect of a timely written dispute. If you believe a company is violating the rules, consider the CFPB complaint system or your state consumer-protection office.

The key is to leave yourself with a paper trail: the validation notice, your dispute, proof of delivery and the collector's response. That file matters far more than how forceful or convincing someone sounded on the phone.