Pathetic customer service

Absolute disgrace how MTN can alter your contract without notifying you. Have a data sim card contract. No modem. End last year they started taking day-time data off at night-time. Went to two branches with no success. Phoned the 083135 number three times with no success. Then when I want to cancel your contract I was put on hold for 10 minutes and then the phone went dead. MTN does not want to help customers. Pathetic.