I need someone from mtn to help

I've been a loyal customer of mtn for over 20yrs. I'm so disappointed in them. I even called retentions to try to help and the lady there was amazing, but there is still no help for me. I had just finished a contract and they called to get me to sign a new one. The person was philani from mtn rewards. He said I could get a new deal i asked if I could share data to other devices he said yes so I was sold, Only thing i want is to be able to share data to other devices. So I called retentions and said what can I do please help. They said take the router back and cancel. I took the router back and mtn had it. But no one is helping with the cancel. I don't know what to do. I don't want to lose mtn money on the contract, I just want anther contract that gives me sharable data. Can someone please help!