Worst service ever!!!!!

I have been promised to be contacted by Vodacom, till this day I have not been contacted. Vodacom has billed me multiple times and that for one item. As well as with my inbound and outbound calls, how can Vodacom slip up with something like this. How can you bill a client 18 times that is only suppose to be billed once. I have asked nicely for several times that the billing department must contact me, coz clearly someone that handled my account is *********** to do their job. Or they are blind for not seeing the mistake they made. This is so unprofessional. And this for a company like vodacom. I will not pay my account and will take it further if this is not removed from my account and my account corrected before month end.