Pathetic service from vodacom.

Absolutely pathetic service!! I called in to a call centre to query why my bill had gone up by R300 the agent informs me that I added on extra data (on a sim card I do not use) 2 months before which I will only pay for now not happy with what she said I asked to speak to a manager who was not available after demanding to speak to a manager, a manager then comes on the line repeats exactly what the agent says and then says shes transferring me without even letting me respond to what she has said. Go to a different department explain to them that I have not used the sim card as I have 3 contracts with them and only make use of one but again the same information is repeated I asked to speak to a manager again who them says they will transfer my query to a different department because I was not happy with the outcome and that department would contact me in 48 hours it's been 5 days and I still have not yet received a call from anyone with regards to this issue I did receive an SMS that states that my query has been resolved which ****ed me off more because I haven't use that sim card in months but I am paying for data that I have not used!! Once my contracts are over I will switching them over to telkom!