mtn stuff up now my problem

I took out a second contract with Mtn in April for a Samsung s6 edge at about 680 or so. And the contract was a my choice option and i asked the lady who was assisting me, Her name is Shenaaz to please make it out to be top-up, meaning that when my contract airtime and data run out it is supposed to stop and i will top up with my own data and buy my own airtime. Firstly they did not debit me for the first month I had to phone them to remind them to debit me. when i was calling them inquiring about the debit order that did not go through I further confirmed with the lady that the contract data and airtime is capped at which she confirmed yes.<br> Now the following month, they debited for about 2500 which they were supposed to debit me for 679/680. i went to an mtn store at campus square and they told the data had not been capped. I then went back to the branch where i took out the contract & service consultant Shenaaz then advised me to reverse the debit order and pay the amount of my contract and she logged a query which to date no one has given me any feedback. the ***. this is impacting on my credit record and ruining my life.