Pathetic customer service (Secunda: Vodacom)

After noticing a massive increasment of about R400 in my monthly bill, I started by contacting Vodacom's customer care line which was of no help whatsoever. I went to the Vodacom branch located in the Secunda Mall for clarity regarding this matter- but the service and assistance was even worse than the pathetic customer care line that is being recommended to call. The person assisting me, told me there will be increasments and there's nothing I can do about it. I told her, I've signed a fixed contract for a term of 24months and an increasment related to tax etc. is understandable- but R400?! With her stinking attitude and her incapablity to provide any form of assistance or service to customers- my situation is still unresolved with no reasonable answers or explanations whatsoever. Vodacom Secunda- Pathetic is an understatement.