Faulty LTE Simcard

I've been with access for over 12 months,first year it was at a different house,fibre worked great,almost never down. Move to New house in told I can't get fibre. I settle for MTN LTE,been working fine for about 8 months,last week stopped working and I've been phoning the helpdesk everyday for 15minutes minimum each call,service agents want us to check the same settings everytime (Robots) I took it upon myself to put the dim card in a cellphone,seems the dim card is faulty as it has no service. Almost 7 days wasted talking to service agents who seem to be reading from a manual on how to configure faulty LTE router,I won't even mention that I logged a call on the client dashboard and have received no feedback accept that developers are investigating the issue. Terrible service!!!!!!!!!