Worst Mobile network

I'm having the worst service with my MTN line; this line has been on Prepaid since 2019 and seldomly used. Now that I use it daily it doesn't want to make calls automatically refuses to dial customer service. R150 airtime left it doesn't make calls automatically hangs up... I can't get no help anywhere, as MTN takes 4 days to reply to emails and there's no support whatsapp. No wonder you can get a MTN Sim off the streets of Joburg without RICA