MTN are *****s

When I took out this contract it was for 20GB day and 20GB night data. Which I had been receiving until a MTN rep called me asking to move me to 40G day and 40GB night. Since then I have only received 5 GB. I have spoken to numerous MTN consultants with receiving the help. It has now been two weeks and my query keeps on being set to resolved. My query number is ***. I have even asked for my contract to be cancelled if this issue cannot be resolved and I have made it clear to the retention department that the cancellation will be at no additional cost to me as I have a contract and they are in breach of my contract. MTN has respect for it customers. My contract is now showing cancelled on the system at a cost of R2800 to me. If MTN thinks that I will be paying this I will block them from my accounts as my records show this has been going on since March.