MTN over charging me!!!! NOT a happy customer

My MTN bill has sky rocketed I use to pay R1156 per month for 2cell phones on contract and now it's R300 more and MTN can't tell me why. I have spent several times calling MTN only for them to pass the buck to the insurance company which is Pinnacle. I have called the insurance company and they told me that they do not have authority to change my debit order only MTN does. So I called MTN back and emailed them, I was given a Reference Number: ********** 2. No one called me back I did however get an email a week later to say my ticket has been closed and resolved.

Good day Sir\Madam,

Thank you for emailing Customer Care. Please note our records indicate that this query has been attended to.

We trust that you find the above in order.

Kind Regards, Palesa Phoku Customer Services MTN SA

Reference Number: ********** 2

So frustrating this is the 3rd month they are overcharging me R300 per month this rate I want a refund or I will be stopping my debit order.

Can someone at MTN please get to the bottom of this??