Good relationship gone bad

l performed an upgrade in April and i took a package for R79, this was an Alcatel package. The service provider was supposed to load 500MB of data monthly. To my surprise in May/June I started receiving 3GB of data. I then went to Autopage Galleria twice and they said they couldn't assist because the lines were down so they couldn't view the contract so I should go to Durban central where I did the upgrade or call the customer care center. I decided to call the customer care center where the consultant said I should hold while she was checking the system, I waited for 15minutes and she dropped the phone. Till this day I'm paying for 3GB of data that I did sign up for. I tried to resist by not paying in June but my line was suspended, I was forced to pay the outstanding amount because I needed to be connected with my friends and family. My phone forms an essential part of my life. On the 15th Autopage debited more than R600 and when I call I'm put on hold until I give up. Having an Autopage contract is now torture. As I signed up for R79 and now I'm paying over R600. Please intervene.