A person calling from XXXX ( XXXX/XXXX/15 ), claiming they are debt collectors, are calling every day. When I answer the phone often hangs up. I called it back, a man answered and asked for my address and last XXXX of my social security number. When I refused and asked for verification he said that he could not give me any information without my last XXXX. He said that this matter was very serious and that I needed to get it settled. He told me to call back after I was ready to verify my last XXXX. He asked to confirm my address, the address he stated was incorrect. I hung up. This number has called several times. Previous numbers include XXXX ( XXXX/XXXX/15 ), XXXX ( XXXX/XXXX/15 ), XXXX ( XXXX/XXXX/15 ). there are also several XXXX numbers calling, I think from the same people.