Bad Business practice

On the 1st of October I email Supersonic after realising that my bill moved from R675 to R779. I paid Supersonic extra to make up for the deficit. I also realised that my funds have not been allocated to my account. I have tried to get hold of Supersonic by Phone and WhatsApp, I have no luck with getting hold of anyone from Supersonic I have been making regular payments to Supersonic.