Missing Airtime and Data, a week later no response

The system did not allow me to change my airtime to Data initially. suddenly my monthly airtime then disappeared within and hour and I had not used the phone. I then loaded a substantial amount airtime and 1 gig which also disappeared within the next hour and 30minutes whilst I was reading a book and not even in it! I called vodacom and the following *** number was given to me. Vodacom did not the decency to call me back to explain what had happened to my airtime not send me an email with the details - instead they sent an sms that had no content---I then called them back and the senior person that I spoke to laughed when I expressed my feelings about the situation that had transpired, to date I still haven't received a call back as they had promised and I still don't know what happened to my data and airtime a week later. It is very clear that Vodacom *****s money from its customers to ensure that they meet their targets! This has not only happened to me but my sisters had to pay 13 000 because they decided to uncapp her phone. It is very disturbing that a company as big and of such a nature can do this to its customers-after all we make their business survive!