Disappointed with service received from MTN

Im disappointed with the service received from MTN, i have had a contact with them since 2017, i renewed it in 2019 n ot was ending this year May. In April 2021 i called to cancel my contract and i was informed to call on the last day of the contract which was the 19th May 2021, i called on the 19th May 2021 and spoke to Mbali from retention department and confirmed that the contract was canceled and MTN will give me 2gb to thank me for being their customer. The last debit was supposed to be on the 25May 2021. However MTN did not debit my account, instead they suspended my services. i waited for them to debit until checked in store if my contract had been canceled m i was told that the contract is still on and in arrears with R409. I was told there was no record of cancellation. I called the call centre n i was told same thing, was then advised that i will be transferred to the retention department for assistance however the call dod not go through "error happened while transferring my call". I lodged a complaint via email and received automated response with *** was told my complaint will be attended within 24hours but to this date i have not received any response. I kept calling the call center n was never assisted until i went to the store and the consultant advised me to upgrade which i did apply for upgrade but my application was declined, no reason was given. I have also paid an amount of R517. 00 as my account was now owing that amount and my services were suspended . I dont understand why it is so difficult to cancel the contract. It seems like MNT wants to keep this contract on their own terms as they told me i am now on month to month basis n i have to pay R100 every month, why would i want to pay R100 FOR 350mb n 50 minutes that does not make sense i would never pay so much when there are so many options. Why is it so hard to cancel my contract when it was so easy to give me the contract. Why am i being forced to keep a contract that does not meet my needs anymore. I just want to cancel the contract.