This number 520-686-5112, started calling my landline about a month ago. The first time it went to answering machine and they actually left a message. Said they are a debt collector and I need to call them back. It gave an 877 number for me to call, which of course I did not do. No way do I owe any kind of back debt, so I figure they are just fishing for someone to scam. I blocked the number after the initial call. Log shows that they attempt to call every few days, or sometimes as often as three times in one day. My advice is just ignore it and block if you have the capability.