Rewards Company is doing their upgrades without letting customers know they are charging large services fees

A Vodacom personnel called me and told me that I am due for an upgrade. I agreed. Now I get a statement with R450 on service fees. I go to a Vodacom shop at Mall of the North and Emmanuel tell me they do not have anything on their systems. He told me a company called Rewards Company facilitated my upgrade and gave me this number to call ***. He told me the store at Mall of the North is a Franchise and can't be hold accountable. I had to go home and call 082 135 to find out what is happening, however they are still charging me R450 which I was not made aware of by their contractor.