<human>: Can you succinctly summarize the text in 1-3 sentences?

Hi guys, back 3-4 years ago I used to have Comcast. I now have Time Warner but anyways, I've been trying to improve my credit. On my credit report it shows I owe $352 to Comcast. This is not the only thing that showed up that was sent to collections. I also owed Progressive, and a few others. Anyways every single company ive called up and asked to send some sort of paperwork that shows what I owe. Every company ive called gladly obliged and sent a final bill.

 So now the only company I owe money to is Comcast. Now I'm not sure what I should do. I don't wanna blindly pay for something without knowing if its correct. After seeing all of this stuff on Reddit about Comcast. I called up Comcast and they pretty much told me they cannot discuss what the $352 is. I even tried logging in my Comcast account and some automated system said since my account was behind I cannot log in online and needed to call Comcast instead. I know I was 2 months behind, however my monthly bill from Comcast was only $29. So if I was 2 months behind that would put me at $60. I returned all the equipment.
<bot>: I wanna do is pay the money I owe to Comcast to improve my credit score, because in honesty I do owe them money. However they wont send me a bill that explains how exactly I owe them $352