Double debit order with no communication

My debit order for my MTN contract got deducted double this month. I did send MTN an email to find out why this happened and described it to me as the following: "Please be advised that the price increase was due to the falling of discounts for the Recurring internet 2GB and Recurring MTN to MTN 200 minutes. Discounts for these services were only for the 1st twelve months of your contract, they are then chargeable afterwards. Kindly advise if you would like to remove them." I rep**** to the email to let them know to please remove these items and also requested a credit as I was not informed of this falling discount. I never asked for them to still add these products on my contract. In my contract it states that MTN should communicate these changes to their clients 20 days in advance should I like to remove them. I received no feedback from MTN. This morning I wrote another email and told them if I don't receive feedback I will report them. Still no feedback. I tried to dial their customer care number more then 3 times. You never get through to a consultant. I think this is very poor customer service. Thankfully m contract will be over in March and I will move my contract.