I get a call from them once a week. Always a different 520 number. It is so irritating. I finally pressed 1 today after "Tiffany's" irritating recorded voice, and spoke to a "gentleman" who hung up on me after I repeatedly told him to REMOVE MY NUMBER FROM YOUR CALLING LIST! He told me this was the best opportunity of my life. I could have been nicer but doubt it would have helped. What a jerk!
I had exactly the same experience, also on my cell phone, which is not associated with any of my credit card accounts. (Except that when I told him I didn't think my credit cards were any of his business, he insisted that they were his business, and threatened to have them all blocked, just so I could see what kind of business he is in). Tom Philips was the name of the man I talked to.