Complain

My name is Portia Dingashe ,I took a data contract on 30 october 2021 the I realised that is no longer benefiting me I called MTN in early february to cancel ,I was advised to pay R663.04 and I paid that amount on 5/02/2022 then on the 14/02/2022 I received a call from a lady from MTN offering me a new contract I ended up take that contract and I paid an additional R233 26/02/2022 boom on the 7th of march 2022 my contract is cancelled , I sent emails to 135@mtn and on complaints at Mtn no response ,this morning I see statement that shows I need to pay R346.91 ,the statement only show the R233 the R663.04 it does not show ,I called Mtn the lady that was assisting me dropped the phone while I wanted to understand .my Billing account is BA***