att wireless and bcr collection agency att wireless ruined my credit chicago, Illinois

had att wireless last year in sept 9th for 2 weeks returned phone to best buy and canceled service .Talked to customer service rep from att told her to mail me a bill if there was any or call me did not hear anything till this year .June 5th got my credit report and there was att saying had bill for 1 hundred and 11 dollars called att talked to woman named barb explaned what was going on and got bill down to 38 dollars told this barb to mail it to me she said could not till july 11th so i waited for bill.Then got little card from bcr saying i owed att 4501 but would settle for 31.56 i e mailed this bcr 20 times before they bcr replyed saying they would settle for 2705.I sent them money order on july 17th and they bcr recived july 19th i e mailed this bcr and asked them if they would send att e mail saying this issue has been resolved and paid in full. Woman from bcr name michell mcdowel e mailed me back and said they bcr contact att wireless weekly and my account would be in there. I called att to see if bcr had contacted them july 22nd and woman from att said they had recived 27.05 but 11.16 was still do. I e mailed bcr this michell mcdowel from bcr and told her that att says i still owe 11.16 she emailed me back saying they bcr had e mailed att and told them that this acc has been paid in full and account is closed. i took a month and two weeks to resolve this case for 27.05 i am the one that wanted to resolve this case and this bcr made it very hard to do like said took i month and 2 weeks to resolve half ass company this bcr