Lie to you about your last debit order date and ***** your airtime

Vodacom are a bunch of rogues. I cancelled 5 contracts in july and I was told the last charge will be in august, then they debit me in September and say I was given wrong information. On top of that when they cancel the contract they remove whatever airtime I have paid them for!! This is bull**** and a *******. I paid for that airtime and it should not be taken away because I cancelled the contract! I want my airtime back!