disgusting service

I receive a bill of 2300 for vodacom that is set to be debited on the 27 which I phone and query as my contract every month is 499 with my hand held device being another additional R 100. They then tell me that I am being charged R1300 for my hand held on its own. I inform then that this is incorrect. I get told someone will get back to me within 24 hours, this was on the 19/03 I call back again on Monday the 23rd and I get told the same thing. A week has passed since my first contact with them and now my account had been debited for the full R2300. I call them once again this morning and once again someone will get back to me. how do they think it is fine for them to debit the incorrect amount. I will cancel my debit order and Definitely to moving to another network that can offer me the service that we all deserve - disgusting service