no service

I was due for an upgrade with vodacom. I went to the store and completed all necessary procedure to have this upgrade renewed. since the day of the upgrade I am unable to use my phone. we have been back and forth to the store and call centre to get this matter resolved. the store manager said that there is a problem with my cell number which they was busy trying to resolve. all they efforts failed. they was supposed to have returned the phone yesterday afternoon working or not, but that has not happened. I would like to cancel this contract and have a new 1 reinstated. please could Hello peter assist in resolving this issue as I do not have the time and effort to do so anymore. it has already taken me 2 weeks of running about and i have no joy from this service provider.