Extremely Frustrated at Vodacom

I called Vodacom November last year to cancel my line that is due for an upgrade. The agent I spoke to was more interested in advising me to keep the line open despite me saying it won’t be needed as I am leaving the country. To cut a long story short I have just discovered the contract was not cancelled as I am still being billed the same amount. I sent through a follow up via the Facebook team. I got bomb barded with questions to validate my details which I provided and clearly stated I called the call centre number as I first changed the debit order date to the end of the month and was then transferred to the cancellations department. Instead of looking into the matter I am them asked question after question. Instead of annoying me further due to your cancellation consultant not doing what was requested you Facebook team are no better. Get someone competent to process my request as I am now at the point of cancelling the debit order totally because of *********** staff employed at vodacom