Horrible Service - again

Cant believe I'm complaining about useless Vodacom AGAIN! I usually buy my data for my ****le at the Cobble Walk branch. They always give me EXCELLENT service. The store was closed and I popped in at the Cape Gate branch. I asked for 500MB of data and the lady at the till wanted to charge me R99 where I always pay R49 at the Cobble Walk branch. When I mentioned it to her, she was annoyed and rolled her eyes. She said I must buy airtime and convert it to data to get that price. So I asked her to do it (the guy at Cobble walk always does it for me). But her attitude was clear - she did not want to help me. Her reply was she didn't have a phone to put the other sim card in. Erm....you work for Vodacom, I'm sure there is a spare phone lying around (why can the cobble walk branch do, but not the Cape Gate branch). I will NEVER support that store again as long as I am on this contract and I'm definitely switching providers when my contract runs out as the data is way overpriced (I go through almost 3G a month) and Im on wifi at work all day and service pathetic. I don't watch videos on youtube so where is all my data going!!