cancellation of number

I phoned in on 16 November 2015 to explain to them that I do not want to continue with my contract but they must move it over to pre - paid. 1st of January my phone is off line no network. I then phoned again to find out that my number has been cancelled? I really need you to sort this out I phoned on Thursday the call centre agent said he will phone me back with in 24hrs I am still waiting, I phoned in again on Friday afternoon, and no body could tell me with who I spoke as there is no names on the system? Really? So I explained the whole story again, also he said I will hear from Vodacom with in 24hrs? Well today is Sunday? My first call log was on Thursday at about 11:00am? So its been 3 days not 24hrs. The number that is locked is ***, so please do not try to phone me on that number.... its locked... please use *** to phone me and please sort out my problem!!!!!