Incorrect allocation done from start of contract.

I was contacted by a MTN agent about 2 months back. Selling 40GB sim only (20GB anytime data and 20GB night time data. This was for R199.00 PM. I took the contract mid month. Recently I have been running out of bundle by the 24th of each month, keeping in mind that my allocation is done on the 12th of each month. I therefore inquired via private message on Facebook what my data PM was as it is impossible for me to run through 20GB in 12 days. This is when I was told that my contract is only 10GB anytime data and 5GB night time data. I am told told that my contract stipulates the same. I do not care about the contract that YOU have on record as this was all discussed and agreed upon telephonically. I do not even have a copy of this contract that is being referred to. This is not what was sold to me or what I signed up for. This needs to be corrected by close of business today with the back dated data allocated. I need this to work and now forking out even more money for data as MTN has gone against what was agreed upon. I will reverse every debit order and will continue to do so until it is fixed. You are not doing what was agreed upon. This will be corrected today. Listen to the call recordings!!!!!!!!!