Vodacom Hi-Jacking cellphone numbers

Contacted Vodacom weeks ago to downgrade my wife's completed contract (which they have been charging for at full rate despite the 24months contract for the device being paid off!) to pay as you go so she could take advantage of a much more affordable 2-year contract on another network instead of the higher-priced 3-year contracts available on Vodacom. After more than 45 minutes of negotiation (not just executing her instruction!), we eventually allowed them 24 to 48 hours to match the deal that my wife wanted to obtain from the other network provider. Needless to say, they never came back to us. Another follow up call with equal frustration and another broken promise of reverting back to us sees her still paying contract fees equal to those inclusive of a new phone, without any new phone. This harassing your customers to the point of submission where you then ignore them and keep harvesting cash from them on lucrative contracts, VODACOM, is literally hijacking people's cellphone numbers and exploiting them!