Over Charging

I app**** for a contract at the Pinelands branch on the 11th May 2022 which included 2 Phones and 2 sim cards. 1sim card receives R65 airtime the other 2Gig data every month for 2years. The original amount for the was R549.00 over a 2 year period. I was billed an excess amount R1282.61 for May and I was told that its because I exceeded my limit. At no point was I ever informed that data will be allocated to that sim card automatically. A query was logged but my issue to this day was never resolved. Just to make sure that I am not being billed for anything extra on my June account, I popped in at Pinelands branch..guess what....another excess amount of the almost exact amount....for excess data using...but this after MTN has promised that I should be billed for anything extra as a ZERO client usage was indicted on my account.