Tracker SA-very poor customer service

Tracker has the worst customer service I have experienced. I was billed incorrectly an amount of R 1 100.00- upon querying the amount billed they confirmed that I was billed incorrectly. I was advised that the amount would be paid back into my account within 7 working days (which didn't happen). I called the call centre to find out what's happening- the first time I was put on hold for 20 minutes only for my call to be put down. Second time I was holding for a consultant for about 7 minutes. I cannot wait for my contract to expire.