over billing

In the last 3 months my cell phone bill has jumped up drastically and there is NOBODY available to query the account with. My bill has gone from being consistently under R1000 to R2300 in april, R2500 in may and now a whopping R3600 in june despite having been suspended for a week in june and also despite having loaded numerous data bundles in april and may. What is also very questionable is that I have a R2500 limit on my account so how is it possible that my bill is sitting at R3600 for this month. I have logged 2 queries through mtn in hillcrest and have heard NOTHING BACK. I am fed up. I will not be paying another cent until this matter is cleared up and I will certainly NOT be renewing my account in September if this matter is not handled efficiently. I believe that carte blanche has shown an interest in doing a story about this so you can either deal with me or you can deal with the media.