OUT OF BUNDLE DATA CHARGED

Since January 2015 I have been charged for a 1GB data. Not once have I reached the 1Gb worth of data but every month I am being billed for out of data. This amounts to over R4000.00 that was billed. Today they loaded a 3GB of data onto my phone. I do not want this data as I already paid for the data I want to be credited for the amount charged for out of data usage that was never used. I cant do anything with the data that was added I want my money back or a credit on my account. I keep phoning the call centre and getting reference number but no one phones with a solution. I have been a Autopage client for years and this service is really pathetic. I am concerned to see how many other people are struggling with the same thing! Please Autopage sort this out. I do not want to phone the call centre EVERY DAY!