Cell C bad service

I have 2 contracts with Cell C. We could not receive or make calls on the one line since 25th Jan. On 26th Jan I logged a call for assistance on the Cell C app. No feedback. On the 27th Jan I called the Technical department and a few steps were done but the issue could not be resolved. A call was logged for which I received a reference number. I was told it would take 24 to 48 hours to be resolved. On the 28th I called again to obtain feedback. Still no feedback - the consultant stated that it takes 24 to 48 hours. I called again on the 29th as this was within the time frame Cell C has given me. Still no feedback. During each call several steps were done on the phone but nothing worked. On the 30th, now 72 hours., I called again and asked to speak to a supervisor. This person was not available but called me back at 08h09. After explaining the situation she said that she would call me back at 10h00. No call was received. I called again at 16h15 but the supervisor had already left. I then spoke to another supervisor who stated that a consultant called at 11h39 but found out that the call was made to the number that cannot receive or make calls!!! I was then told to do a sim swap and if that didn't resolve the issue, the case would be escalated. I find this totally unacceptable. We are paying for a service but not getting the service. What do we do now?