Bad LTE service form MWEB.

I had an LTE contract with Mweb but I cancelled in about a week, they were unable to deliver the service I signed up for and now they charged me an excessive cancellation fee. That is unfair because they were the party who breached the contract, out of the seven days I had about two and a half days internet connection. Secondly, they have no e-mail address to complain since I am hard of hearing and find it difficult to hear on the phone and hate to hear that I am number 101 on the line and hold on for 20 to 50 minutes. That is to hear that their ISP (Cell-C) had a power failure, (NOT MY PROBLEM) mweb supposed to deliver the service which they obviously cannot and I've been penalised for cancelling. **********