I have been calling them since October 2017 trying...

I have been calling them since October 2017 trying to pay a old Sprint bill, Yes, I'm chasing them. I have spoke to 3 people , first one was a rude douche and made it clear I wasn't getting helped but the other two were polite and tried to be helpful but I still haven't heard back. I paid all my credit and am waiting on this one. What kind of collection company doesn't want there money !?!?? I asked for a letter, a email, fax with my info and this seems to be a crazy request! It took only a day to pay others off. This place is rediculous. The fact I know they have people calling and stalking others for there debt and ignoring me. I'm sure Sprint would love to know how hard they're working on there debts. Lol.