New contract hassles and missing data

Good day, This is my 4th contract that I’ve taken up with MTN and I still get incorrect billing for the first month. How can a R299 package equal up to R798 at the end of the first month including pro-rata which shouldn’t even be over R500. I’ve been logging calls with service agents and spending up to 25-30 minutes on each call then eventually getting frustrated waiting for a reference number that takes 10 minutes to retrieve from an agent. I’m not going to pay R798 for incorrect billing, I will pay for the prorata + my normal amount. Please sort this out with me ASAP. I’m tired of having to come to hello peter because no one else wants to help with anything.

Adding to this, I’ve called numerous amounts of times trying to receive my night data because only 10GB was issued to me when it’s supposed to be 30GB, from last month, nothing has happened and I’ve still got to pay for data that I haven’t even received as yet? Please get back to me ASAP.