Incorrect billing

I took 2 new contracts. 2 huauwei p30 lite both for R579 and Data fir R299 and R30 for the router. I asked the consultants to put all sim cards on 0 limit and she did not, on the 2 Huawei i was asked to pay R100 for a sim cards as the phones only came with kne sim cards. Khanyisile acknowledged the mistake and told me that the Manager was going to refund me. The 3 new sim cards including the data one are no more in use and the 1 if the old ones. Im using only 1 number and im expected to pay R2600 which i wont pay. With the old contract i was paying R784 plus R908 of the new contract, it must be R1692. Ive asked them to cancel the data contract and i will pay for the router and i have been taken from pillar to post. Im now going to the ombudsman and the consumer protection. Im now tired of MTN **** service. Ive been a loyal customer for over 15 years. ***