Poor service - *****ing my money

I have been a good and loyal customer of Vodacom for years. I have three contracts with Vodacom. My data contract (10GB ?)was supposed to end ended in March and I have called Vodacom in January notifying them that I don't want to renew it /want it to be cancelled. I then took another data contract for 200GB hopping that they will cancel the initial one. I then realized that it was never cancelled as they keep on debiting money on my account. I called again to cancel and they confirmed that it was going to be cancelled- trusting them did not ask for a reference number. it was not - I called again in April 26 to cancel they gave me ref I-***. checking my debits order - it is still not cancelled. Am I being bul**** , treated like stupid. need my money back !!!will escalate this matter....