Violating my consumer rights, bad producd

I bought the earo as one of the kiosk attendants advised me that this is the best on the market and that the coils last up to 4 weeks.From the beginning the thing has not been working right and it has been spitting liquid into my mouth,I went back to the kiosk at fourways were I have bought my aero and the lay advised me that it is because of my battery, but unfortunately she cant exchange it as she does not have any stock.She said that I could give her the battery and I had to wait 3 weeks to get a new one. I asked her what I would then be smoking for those 3 weeks and she just pulled up her shoulders and said I don't know.I then went to the kiosk at the glen and the lady gave me her demo battery but it was no use as the liquid was still spitting into my mouth.I then decided to phone head office and the manager said he would phone back.I then decided to go back to fourways and the guy tried to see what the problem was.He said that it is not the battery but the hole chamber and he had to sent it in and they will send me a new one, at this stage I asked for my money back and was advised that they would deduct R 390 for usage fee,now I have to lose R400 for usage fee for a broken pro