Wholesale Data Bundle Charges

During February 2015 I signed up for a R99 Data Bundle contract with a cap - meaning that when the cap is reached, you have to wait for the new month before using the bundle again.<br> The Data Bundle is used by my dad and he understands and agreed to the terms.<br> He received a sms offering him a Wholesale Data Bundle which he ignored.<br> Then the Wholesale Data Bundle charges was added to my bill. I have phoned MTN and written emails numerous times to remove this Wholesale Data Bundle option from my account. But instead of doing that, they add more each month. MTN is a bully. They are adding charges to my bill that I have not signed up for, and if I refuse to pay, they blacklist me. Please provide me with the Ombuds contact detail to escalate the issue as I do not receive any feedback from MTN.