Vodacom is a *******!!

In November I have purchased a black friday 5gig on special, not know that this was recurring, after vodacom had already deducted my installment along with the 5gig bundle I have contacted vodacom on 27 December to cancel the 5gig bundle and I was assured it would be canceled. I received a reference number:***. On 29 December I received a sms to advise it was canceled. I called vodacom today to make payment as my debit order bounced only to find out that they charged me again for the 5gig which I CANCELLED and I never even received! Why would you charge me twice when I only got the bundle once! I demand to be reimbursed and this to be sorted. What a joke