I was called by the collectors for two or three months, several times a day. I asked someone. I always took the phone and listened carefully. Sometimes he asked me to call back without answering their questions. He always said the same phrase "... it's probably the previous SIM card owner."
I got bored and they gave up first. I was asked to contact the bank to ban calls, explaining how to do it. I said I was lazy and they didn’t tire of me yet.
When connected, they began to often throw the phone. Then they stopped calling.