Breach of Contract

I took up a Black Friday contract in Nov 2016 consisting of 50GB of data. Upon my contract ending in 2018, MTN Direct hounded me to renew and offered tailor made packages based on my usage of the 50GB. I was offered a really good package consisting of 7GB, 450 minutes and 100SMS. I received the correct amount of minutes, SMS and data until Nov 2019, where I suddenly received only 4GB. This did not even match the monthly recharge SMS I received from MTN, which clearly stated 7GB. I have called MTN a million times, I have even gone to the Oubadsman and MTN (Timothy Clouts) promised to get a copy of my recording or contract and to send additional data until the matter was resolved. Two months later I have still not received any contract or recording or any additional data. This is breach of a contract MTN and I am not going to drop it. Either you provide me with the data I am entitled to or you cancel my contract and let me go to a network that will stick to their promises.