New LTE Sim card

I received my new LTE simcard last week, but i have been unable to activate it. I followed the instructions on the letter i received, it keeps telling me an error have occurred and i have to try later or phone 808. After a day of trying that, i phoned 808, and after a long queue i got helped. The lady said it would be fixed in 24 hours. It wasn't. I tried to rate the service afterwards when they sent me a message to rate it with *130*083*12#, but even that told me it wasn't registered on the network. Then i went to the MTN shop. I was in a queue for 50 minutes only to be told i must phone *** to fix it. I've been trying that today, and the call keep disconnecting. I don't know where to go next, as i've tried all avenues i know. I've been a loyal subscriber to MTN for 18 years now, and i would expect better service than this