Unsatisfied Client

I would like to lodge a complaint I'm dissatisfied and disappointed by Vox Telecom,I took a SIM contract with 20gb amount of R120 then invoice that was issues the total amount was R330.95 and I questioned it and was advised it's for connection fee ,I've upgraded to 40 GB which is R175 per month now they charged me R377.18 I spoke to sales department no one informed me about extra charges I'm disputing the amount that was debited without my knowledge/authority I need clarification why the amount was debited. Your service is very poor you dont educate clients , I spoke to a gentleman yesterday regarding cancellation process I advise to go through my email and check the reasons for cancellations and I also enquiry about the amount that was debited he promised will come back to me with the feedback, today the same guy called with out the feedback asking if he can proceed with the cancellation,I'm so disappointed he was not representing company at all .