Terrible Service from Mweb

In November 2023 I renewed my microsoft 365 package that I have with Mweb but instead Mweb took it upon themselves to cancel my package and charge me R1 500 cancellation fee. I have been battling since then to try and get Mweb to correct their mistake. Numerous phone calls later and the problem had still not been sorted. At the end of December they debited my bank account with R2 200 instead of R740 (my monthly subscription). Since the debit order amount was incorrect and Mweb did not attend to my query, I had the debit order reversed. I then contacted Mweb to follow up on my query again and to request the bank details for me to pay the correct monthly premium amount of R740. I was told that a credit would be passed on my account for the cancellation fee and I would receive an sms with the bank details. The credit has not been passed on my account and I am still waiting for their bank details to pay the normal monthly premium. In addition to that, my account has now been suspended. I called them again and again I was told that the query has been escelated and that a credit will be passed on my account and my services will be reconnected. Still nothing has been done and now I can't even get through to them on the phone. Such terrible service. What do I have to do for them to correct an error that they made?