Vodacom doesn't know what happened?

In December 2014 I upgraded telephonically with Vodacom Business. The package I selected was the Smart XL with Samsung Galaxy S5 Mini (With Galaxy Gear Fit). I provided my work address for delivery of the handset. As the handset was not in stock I requested that should delivery be after 12 December they should deliver at my home address as my office will be closed. They delivered the handset to my work address after the 12th but as mentioned there was no one to receive the delivery. In January 2015 I contacted Vodacom Business to find out what happened. Two days later my new handset was delivered. BUT for some reason my contract was not migrated to Smart XL. I also did not receive the Galaxy Gear Fit. I am still on the old Smart Advanced package and I am paying more than I would on the new Smart XL package. I receive 500MB instead of 800MB and have now incurred extra costs for out of bundle data rates. I have phoned numerous times and every time the person tells me they don't know what happened and they will phone me back, but never does. The last time I was told that I should pay R600 to migrate to the new package, but Why? Because of a mistake that Vodacom made? Ridiculous!