Poor Service

My mother's contract expired on June 22nd. We've been trying to cancel the contract for more than a month now. Firstly, they told us that it's not possible to cancel a contract instore, so we had to contact the call center... after a lot of back and forth, they informed us that the contract could only be canceled once we paid a settlement fee of R144.97, which we did on May 31st. The contract was supposed to be terminated at the end of June, however, it is still not done and the benefits for the new month is already loaded. We do not wish to continue using Cell C's service for another month and would like the new benefits reversed and the contract canceled. However, it seems that when it comes to cancellations, nobody is really interested in helping you.