Absent management at MTN for excalated issue

I approached MTN branch in Eastgate on 30 April to upgrade my contract. My contract was upgraded except that the product offering was not entirely delivered. My data and sms bundle were provisioned for, however my minutes have no been credited yet. This left me without the ability to make any calls - this is my primary business line which is used extensively on a daily basis. I have approached the Eastgate branch on numerous ocassions and called your call centre and demanded to get the contact of a manager which they refused to provide. so, today, a week later I am still in the same situation. MTN is robing me of what they committed to providing in my contract. and to make matters worse, nobody at MTN cares - what a non-customer focused brand. No wonder MTN's latest annual results were shocking. AT this stage, I want to cancel all my contrcats with MTN and move to a brand that has active management dealing with escalated issues. MTN the worst consumer brand,