EXTREMELY CHARGED FOR PACKET SWITCHED DATA CALLS

I've been on a 1GB data package which from day 1 I asked to stop should I go over the 1GB and I hardly use the data anyway. The whole period of the contract I only paid R89/month. Since January 2015 I received extremely high billings and nobody can proof on which sites etc this data was used seeing it is supposed to stop at 1GB! I had to stop Debit orders for R3373.54. I got billed for R346.16, R472.59, 834.48. Nobody can give me answers. This only started January 2015. I queried March already and with no success. My cellphone which I pay R179.50 for get suspended and I am not able to make any calls. I need a someone to attend to my query urgently as my next resort will be seeing a lawyer which I already made an appointment for on the 10th of December 2015. In all the years I've been with MTN this is the poorest service that I received and if this carries on I will take on another service provider. Taking everything in consideration MTN owns me a whole lot of money!!!