Failing to upgrade-Call centre can't,Store can't

I am finding it almost impossible to upgrade. Telephonically they say they cannot upgrade with their new system and I must go into a store. When I go to the store they say they aren't trained to upgrade on new system 3g to 4g, no stock and the upgrade line is closed at 17:30 when I arrive there at 17:35. It seems Vodacom does not want to upgrade me and retain me as a client. I migrated from Nashua Mobile and their service was a 1000 times better. Very disappointed with Vodacom. (4u store at Northgate specifically all staff)Still have not been upgraded and am ready to give up or migrate. Very poor service!!!