Network issues

I've been a vodacom subscriber, due to some personal issues I ported to cell c, now it's been a year since I ported to cell c. Now that I've sorted out my issues, I ported back to Vodacom. I've been to vodashops 3 times, do all the necessary steps required, but when cell c have to take out my number from their network for me to become vodacom subscriber it's not happening. It's almost 2 months now, when I call them they say I should contact vodacom, when I call vodacom they say everything is OK on their side the issue is with cell c. Isn't it my choice to choose which network I want to use. And I can't change the number since I've done a lot of business with this number. All I want to use vodacom. Is that hard to take out a number from the network.