RewardsCo not honouring their contract

I was offered to upgrade on my data only contract which was the My_MTNChoice_80GB, to "technically My_MTNChoice_160GB, as the agent from RewardsCo said that I would be upgraded to double what I was currently on, for R260, which was less than what I was paying on the My_MTNChoice_80GB.

I agreed to these terms and took up the contract, only to find out that what I was offered doesn't exist and what was loaded onto my profile was My_MTNChoice_40GB, which is half (NOT DOUBLE), what I was on before thr 'upgrade'.

I have spent countless hours and airtime that I will not be reimbursed for trying to hold RewardsCo to the contract that they offered to me.

Their solutions are for me to either migrate to another package(which doesn't give the the total amount of data as stipulated in the contract they offered me), or revert back to what I was on My_MTNChoice_80GB. These options are not in my interest as I have a valid contract with RewardsCo for technically My_MTNChoice_160GB with the addition of promotional data broken up as below:

There are also additional benefits added such as : Calling Line ID Restrict SIM Calling Line ID Presentation FREE MTN Video Streaming 20GB Recur FREE MTN YouTube 10GB Recur FREE MTN Music Streaming 3GB Recur FREE MTN Music Streaming 1GB Recur FREE MTN Music Streaming 3GB Recur FREE Anytime 10GB Recur FREE MTN Music Streaming 3GB Recur PROMO Night Express Data 10GB FREE Anytime 30GB Recur Itemised Billing MTN Night Express Promo 30 GB.

I should be getting 80GB day and 80GB night data, plus the additional promotional data as stated above.

RewardsCo did their own investigation and listened to the call where the agent offered me what I have stated above and concluded that my version of facts was indeed correct. However, RewardsCo does not want to honour their end of the valid contract that is in place. They are trying to get me to cancel the contract amd take up something that conflicts with the valid contract in place.

If the facts that a valid contract is in place aren't in dispute, why do they refuse to honour their end of the contract????

They do no follow up or call back as agreed up, the call randomly cuts during the conversation, leading to me having to talk to a new agent.

This has been going on for over a month without a reasonable resolution that either puts me in the same position or better as what the contract stipulates.