Telkom crippled billing system

So on December 2021 I was due for an upgrade and I decided to go to Overport City to take a Data special which was 40GB+40GB which was supposed to give me an additional 40GB+40GB which adds up to 80GB+80GB. On January I noticed that I was only getting half of what was promised (40GB+40GB) so on February I stopped the payment and went to Musgrave Centre, the contract was cancelled and I was ordered to do the payment so they can rectify the mistake and open a new contract and so I did. The payment took about 4 days to reflect and I went back to Musgrave Centre and a new contract was opened on February 2022. From then my bill just skyrocketed. I am supposed to pay R528/month because I have 2 contracts (One for R329 and one for R199) The bill for February went to R1258, on March (R627) which was okay and on April it went to R2086, on May R1459 was debited on my account through Nudebt and on this month I am supposed to pay R1757.40. I am defeated because when I go to the branch I am ordered to call the call centre which doesn’t help me with anything.