The worst service provider

On the 01 of feb my cellc line stopped working I called and was advised the sim could be an issue an I should do a sim swap. Done it and the consultant advised it will be working shortly. After a while still nothing I called back And each time a consultant helped the response was different I then was advised I need to do it again.called again and the consultant said its done I need to 4 to 24hours. Done that and it's still not sorted. Yesterday I called several times and they still were unable to assist. The last call I was advised that it's a 24 hour call centre for contracts and I was then advised that they cannot help. I have made over 30 calls to cellc. The service is shocking.the call Centre staff are untrained. I asked for a team leader and no one called me. I have had my contract for 12 years and I am do disappointed with such terrible service. A sim swap should never be such a hurdle. This is my main business line and now unable to make or receive calls.its now the 03rd and still not rectified...