Contract Ended But Still Being Billed

Here we go again. My Vodacom contract came to an end in February as the 24 months as passed. I strated receiving sms stating the my contract is being cancelled, only to my surprise, it was never done, I am still being billed for march even if my contract ended in February. Clearly Vodacom are only trained to lie to customer and not deliver a service as requested by their customer. I am sure it is illigal to just continue a customers contract even if it expired. VODACOM ARE REALLY OUT JUST TO P.SS OF CUSTOMER AND NEVER WANT TO COME BACK.