This sounds like a debt collector, potentially. If you’re getting calls from a number you don’t recognize, start by verifying the caller’s identity before sharing any personal info. Ask for a written notice and check the company’s licensing status with your state’s consumer protection agency. Keep a log of call dates, times, and what was said; it can be useful if you need to file a complaint. You can also register the number on the National Do Not Call Registry to reduce future unsolicited calls. If the calls persist, consider reporting them to the FTC or your local attorney general.
There is a strong possibility that this number is being used for debt collection purposes.