Terrible service from MTN regarding contract upgrade

I have had such pathetic terrible service from MTN that I had to share this.My contract with them was coming to an end late last year and I wanted to end it but was given a call from their retentions department and offered a contract of 50 G day and 30 G night if I remember correctly. They told me then if was an offer to keep me as an existing customer and it was an upgrade deal for R99 only, so they convinced me that it was a great deal for me. It was a data deal and comes onto my router so did not ever see that they have been only giving me 8G. Sometime this month when my router stopped working I decided to use that som on my phone and that's when I noticed how little data I have been receiving and called MTN to enquire. I have been given the run around from contracts department, to retention, to legal,etc. I have been making long longs with zero answers and I keep asking them to listen to the contract and tell them that I did not sign up for that contract. Then they assigned my dispute to Ignition group not telling me why that is so. They took a long time to respond even though I was promised that my dispute will be resolved from 2 -72 hours. I received an email 2 days ago telling me that they have listened to the video and they confirm that I entered into that contract but did not bother to let me listen to the recording that forms our contract or to call me to ask me questions as I am disputing the material terms of our contract and that I did not agree to the 8G contract at any stage. Why would I agree to a lesser contract when my contract ending with them was for 10 G! That is shooting myself in the foot!!! I have since requested a copy of that verbal recording contract to hear how they have come to that finding and have had no response. I was just sent an email saying that the dispute is resolved. It can't be resolved if I have not received adequate answers. I want better answers than a single email with zero reasons. Absolutely shocked and horrified at the poor service that I have received as I have been a loyal customer with many contracts over the years. All I am asking for is that if the recording is saying what they are saying,I need to hear it and I won't dispute it anymore but if it is saying what I know I have said then we have a contractual problem that needs to be rectified with immediate effect!