Upgraded Phone but still not Migrated

Hi there, I upgraded one of my phones in June 2017. the Phone arrived on the same day. I had upgraded it online from a Flexi 110 to Smart S Top Up +. The phone number is still sitting on a Flexi 110, The Airtime and data is no longer allocated. I am wanting to know when is the phone number going to be migrated to the Smart S Top Up +. I have been to over 3 Vodacom stores and phoned many times to sort it out. Everytime they tell me it will be migrated the next day, and the next day still the same and it has not been migrated. I have gone on Twitter and Facebook to try and sort it out. It has been over 4 months now. Upgrading online is not working as the service that you get is unacceptable