Poor services

Took a data deal online with MTN for monthly subscription of R299 where I will get 50Gb daily and 30Gb night Express as per the agreement. First month was billed R1001.58 and not the R299 we agreed up on. I went to report it by calling them and they said they will get back to me and no one did. I the reversed the whole debit order. Second month the charged The same R1001.58 plus the R299 for the second month. I reversed it then went to the branch where they logged a ticket but still no one assisted even their staff member, the ticked was closed with no communications to what the resolution was. No one called the lady from the branch the tucked was just closed. This is the third month MTN just blocked their services where they are the ones in the wrong. I have tried to fix it from my side to correct the billing but no one is willing to assist. Poor service