Worst service ever

Wish i could give less than a 1 star. I made the mistake of paying them twice the end of last month. Sent through my proof of payment aswell as the banking details to where the money needs to be paid back to. Receive a mail confirming it has been processed and it takes 5 - 7 working days for the money to reflect in my account. The 7 working days was last week Thursday 17th April. I spoke to a consultant who confirmed with the so called "back office support", who strangely do not have any way of contacting them apart from an email address, that the money would reflect in my account on the 17th. Today is the 23rd and i still wait. I called in yesterday againe 3 times to see if there was any feedback and left a message for a "supervisor" to call me back.....still waiting. No wonder MTN have such bad reviews..........they are quick to cut you off if you dont pay, but when they owe you money they are silent