Account handed over to attorney

I'm struggling to get my Vodacom account sorted out. Place a few complaints on Hello Peter then they contact me and resolve a portion of the problem. About a month ago they passed a credit note for R705.00 and I asked the gentlemen a few times does this sort out the account or not. He said that was all he could see on account. When I queried account I was told it was handed over to a collection agent. Now received a message from an attorney to contact them regarding my account. I requested more than a year ago they change my contract to pay as you go which they've never done. This resulted in very high accounts that I told them I cannot afford when I originally requested the change. I continued paying the account till August 2015 but the account was still overdue. I feel since Vodacom blocked my account after they didnt change my contract as I requested I dont owe them for the account balance. Vodacom was my supplier and I requested a change to my contract. which they did NOT do. I want them to sort out my account and if there's any judgement to my name they need to ensure it is rescinded.