MTN Data sharing

I upgraded my contract on the 4/10/2018. On my old contract I shared data with my wife and there was no issue. Towards the end of November she stated complaining to me that she had no data but I had a lot, I could not understand. In December I had a closer look and decided to call MTN call centre and was told that the new plan I was on did not allow data sharing. So now I have a total of 5gb which I cannot use up. I went to the store and was told the same thing, I asked why was I not informed when I took the contract and I even asked for top up of 3GB so that I can continue sharing the data. Dean Reddy the manager said I should have read the terms and condition on my contract. So yesterday after I left the store I read the terms and conditions and nowhere does it state anything about data sharing. I don’t think he knows it himself. I told him he needs to implement the share or remove the top up 3GB that his store sold me that I have no use for. He was not helpful at all. I asked that he cancel my contract and he very gladly asked me to contact the cancellations department. Is this how you treat loyal customers for over 20 years. I was on MTN Made for me L and upgraded to MTN Made for me M