Complain against MTN SA network

I’m a customer for MTN network , I had contract with MTN my contract was due for upgrade therefore I had app**** for upgrade on 3August2020 I then receive the feedback from MTN through Email address that my request is processed for approval and my package will be delivered within 5 to 10 days . Then I had phoned MTN on 26/08/2020 to find out about the progress of the upgrade therefore the Agent told me that actually my contract was lapsing on 19/07/2020 , but Mtn continue withdrew my money, but I never mind that cause my contract was not cancelled , As I was asking about the progress of my Upgrade , the Agent tells me about other packages or offers that they have , I then told him that I don’t want the one he’s telling me about , I want the one that I have app**** for and I do have reference number therefore he ignored my explanation he told he can only offer me the one just explained to me , I refused he’s offer , I told him that I want to cancelled the current contract cause is not benefiting me until they delivery my upgrade that I had app**** for . After 1 to 2 hours I realize that my Airtime and Data bundle has vanished excluding SMS’s , I had to call the MtN Agency again then the Agent told me that after cancellation of contract you forefeet everything patterning contract, I then told him that is not true because if it was like that I could have loose my SMS’s too cause is part of the contract , I then told him that my Data bundle is not part of the contract so I need them back , then the Agent told me that she writing a report to the Technical therefore within 24 hours I will be answered I then waited more than 36 hours then I make a follow up then the Agent from Prepaid send me to Contract Agent and Contract send me back, so I don’t know what to do anymore, please help