Vodacom *****s money for non-service

Dear Vodacom, selling your clients a product (Call Limit system) that doesn't actually work and then hiding behind your terms and conditions when your product fails to do as is advertised to your client (Me) and then expecting your clients to be happy with your service is bad business practice and equivalent to *****ing from us. Why have a call limit system at all if you are going to turn around and tell me \IT'S NOT GUARANTEED"when my bill goes beyond the said \""Call limit\"" and then expect us"