so poor service

My contarct is 300mb, 200 sms and 75,00 airtime, and R50.00 cap that was put on, so this means that after my R75, airtime is finish it should not be able to make any calls Right? Right so now I get a bill with R110.00 for phone calls? I send in a query (email) and on the internet on the 10 June 2015, yet until to day no respons!!!<br> I ask how much should I pay in to end this Contract, till to date no respons, Vodacom you really are so poor service, I can wait to cancel my contract with you!!!<br> only time you respond is very we put something on hello peter, that tell people a lot about Vodacom.<br> my Vodacom no ***... if you got time please advice me how much should I pay to cancel this contact as im not sure I can last another 16 months!!!