Frustrated Customer

I feel I have been treated badly by Vodacom with their promotion called easy2own I paid off my cellphone contract with Vodacom easy2own some two tears ago. But after few months of completing paying the cellphone contract and the phone was locke up I could not access any apps and could not make calls on the screen only a massege shown to say that I am owing. I tried to contact the Vodacom call centers but no one could help I am frustrated because I don't owe Vodacom anything and funny I always recieve masseges encouraging me to take another contractor cellphone despite the fact that I am unable to use the one I have paid up long time ago.