Horrible service and ***** in Vodacom

Terrible service I've got from Vodacom, I've been a loyal Vodacom for a long time but recently they upgraded my contract without my concern, and claimed it was caused by prices increases. When I was trying to cancel my contract they told me, I can't cancel as my contract was upgraded. A month later my contract upgrade was reverse without a reason and still my contract was not cancelled. In August they billed my account with the contract amount that I called in to cancel. In September I thought it was settled as I got an SMS that they will credit my account with around R1100 in 3 to 5 days and even today they haven't done that and they still taking me from one consultant to another