MWEB's pathetic support

I have signed up for a Voip service (in addition to my fibre network) which was effected on 08 July 2020. I need to note that MWEB couldn't quickly enough call me to do the registration!! The Voip number provided is not correct as I was provided with alphabet letters and not with a number and I can therefore not register the Voip number on the smartphone app. I have to date logged 4 tickets with MWEB to resolve the matter (3 that has been closed without assisting me to get the matter sorted, 4th one logged again today) Despite the fact that I cannot make use of the service due to MWEB's fault, MWEB has deducted the fee for the service (pro-rata & monthly fee) and get me right - its not a lot of money but the principle - How on earth can you invoice a client without the client being able to utilize the service due to YOUR mistake and continued non existent service?????????????? MWEB was quick to call me to register me for an additional service but to date I have not received 1 call (despite 4 tickets for the same problem - all referring to the previous ticket logged) to help me to get the service running - THIS IS UNACCEPTABLE!!!!!!!! I want the correct sign on details AND a credit on my account for the period that could not make use of the service.