Vodacom deducts money with out consent

Vodacom decided to bill us 1700 after not even inform us that we have a open line on our data and no limit!!!!<br> we then asked ...FOUGHT to make sure it gets deducted off over THREE months and they go and deduct it all at once!!!<br> i try and call the and they all have the worst attitude!!!!!!<br> shocking shocking!!!!<br> once this is paid off i will leave vodacom and never recommend it to any one!!!