MTN fixed LTE disaster

They migrated my Cell C fixed LTE to MTN. Received the MTN sim and was charged to a months data on 20 November. It was only after countless online tickets that the SIM was activated, on the 4th of December... It worked for one day and now the router shows disconnected.

I'm paying for data that I can not use.

Trying to contact their support team is impossible.

I am beyond frustrated with their utterly bad service.