Vodacom ripping of clients

i am disgusted by Vodacom, I tried calling Vodacom in Menlyn 25 times with no answer, i then went there to take out a new contract. my first question was, "DO YOU HAVE STOCK?" and he the sales man assured me they have stock, we went to a different sales consultant and all of a sudden they dont have stock. how is this possible? i then went and bought a phone from a diffrent Vendor. I returened to the same Vodacom in Menlyn to do a file transfer. on the form it states clearly that a back up is R100, and the download of the mentioned back up is R100. (I verified the price at four other Vodacom shops, they all charge the same) they then gave me a bill of R400... any reason why this would be doubled?? the price is only givven to you after the data transfer so you are forced to pay as the job is already done...