Poor poor sick service

Again I am experiencing horrible service from Cell C. A couple of months ago they offered me a data contract upgrade which I dully accepted because it was a great deal or so I thought. To my surprise I received an email with double the amount monthly installment than what we agreed on. I called them to query this which I spoke to a lady by the name of Khanyo who did pick up that they didn't factor in the discount and said that this would be resolved & I was going to receive a call within 48 hours. That was last & I haven't received that call instead they sent me an SMS reminder yesterday with incorrect debit order amount. This is the second time this has happened with them so it's either their is *********** or they de***** clients.