Refusing to Cancel Contract and Failing to update my Telkom Account

What a terrible service from Telkom it's been now over 4 months dealing with one issue, trying to get a second contract I took to be cancelled and after involving ICASA finally I got the contract to be cancelled, but now I am still left with an outstanding bill from a contract that was cancelled 3 months ago worse part of it I had never even used the services.. Contract was taken 02 of April 2019 and I went the very same day to cancel it and sent back the device to the store, but to my surprise the store manager and her sales lady by the name of Phumeza at Stellenbosch Telkom store refused to cancel it with no valid reason. With the help of ICASA it was finally cancelled 3 months later. But then again this past Saturday they have suspended my internet saying I have an outstanding balance from a non-existing contract which I have been fighting with them to update my account since then... At this moment I have lost all my energies with dealing with Telkom looks like all the customer agent are so *********** and lack customer s****s.. Telkom's customer services sucks to the core so I am now sitting with a router that has no internet but I have made payment for it.. I just don't know what to do anymore with this..