Fixed Wireless Sim Card problems!

From experiencing extremely bad problems with ADSL and the amount of months Telkom takes to help to being advised to change to Fixed wireless LTE internet. We changed to the router option and it only worked for a month and now the Sim Card does not connect to the network anymore. Telkom call centre was extremely useless and didn't resolve my problem at all after being on the line with them for over 20 minutes. I then go to to a Telkom Branch, wait in the line for over an hour for them just to tell me they don't know what the problem is and will escalate it to I.T and can take 24hrs - 72hrs response. I'm still waiting for the response on what the hell is going on with our LTE Sim Card account! I'm really fed up with Telkoms bad service and constant problems.. it's costing me a lot just to put up with this nonsense and already thinking of closing the account and move to a different network. Fix our LTE account connection problem and stop taking weeks and months to help!!!!