Not satisfied with change in LTE product process from Cell C to Telkom

I'm disappointed with the process to change LTE provider from Cell C to Telkom. Essentially Cell C LTE comes to an end on 30 November and Mweb has not come through on delivering new LTE Sim required from 1 December 2019. Mweb promises that they changed the RICA address at the courier company facilitating the Sim delivery but it hasn't happened yet. I have had to make numerous follow up calls to Mweb and the couriers without any success. I had to have the new Sim in hand by tomorrow because of work constraints but it is unlikely. The change has been a problem from when I placed the order to change about two weeks ago - Mweb didn't process the order due to a system fault causing the time problem. The result is no connectivity for the next week and a half.