Vodacom - non release of cell number after contract cancellation

Thank you to hellopeter for finally facilitating a response from Vodacom to cancel my contract. Unfortunately my issues with Vodacom continue. Another provider, has tried on numerous occassions to port my number over from Vodacom, but apparently Vodacom has still not released my number. This has been going on for weeks, with Vodacom continually saying the contract has been cancelled and I am on 'pay as you go'. As they will not/have not released my number, I cannot move over to my chosen service provider.