MTN overcharging me

This seems to be the only way MTN resolves cutomer queries - sad but true. I have written a review a month ago with regards to poor service from the MTN Fairland shop whereby I waited almost a month to get a data contract. This was finalized with the help of my review on the 08 April. I have been in contact with the customer care number but keep getting pushed from pillar to post. My problem:

1. My debit order for has not yet gone off 2. Upon checking the details of my statement I am being billed almost 4K for this new data contract when in fact it is just under R800 ( I have double checked my contract) 3. I am than also billed for a @ Home data contract which is not in my possession 4. From my understanding an the consultants assurance my data contract is a top us i.e. 30G day & 30G night once expired I will need to purchase and my MTN account will not pick up the debit of the purchase.

Please can someone urgently look at this. I have copies of my signed contract. There is no way I am able to afford R4000 for data ????