Twisp Faulty Product Trouble

So, on Saturday (late afternoon) I headed to the twisp shop at Pavilion. I purchased a Twisp Cirrus that came to the amount of R850. I used the device for the afternoon and into the evening. In that space of time, I had to fill the tank 3 times. On the 3rd time, the device started leaking through the airflow control. I left the device overnight and in the morning, still oil leaking out. I wiped it down and headed back to Pavillion to exchange the device. Keep in mind it is less than 24 hours old. There was evidently oil all over the device when pulling it out of my bag and the lady helping me saw that. She wiped it down, undid the whole device, wiped everything down again and filled the tank. On twisting the airflow control, the oil was visible and she said it was excess from the previous leak. Much to my dismay, I was told to go away for 3 hours and come back so that they could 'test the device' that was evidently leaking! 3 hours! I disagreed and asked her to call the manager. The manager was unable to assist and the regional manager called. He said to the lady helping to refund the device. I wanted to exchange. I specifically told them that I would take a different device and pay the difference. I was told that the device could be exchanged, but the 50ml oil (R250) which I'd hardly used could not be refunded or exchanged for other oils - because it had been opened - and that in addition to paying the difference for a new device, I would have to pay for a new oils. I find this truly unacceptable. I ended up paying an additional R300 in total on top of the R850 I'd already spent. How does a company this big justify that? THE PURCHASE WAS WAY LESS THAN 24 HOURS PRIOR!!! The regional that I dealt with said that HE was doing ME a favour by allowing the faulty device refund already and that it's just the way the twisp policy works and there is NOTHING more he could do concerning the money I lost for something I could not use with the new, alternative device. The service from this regional was disgusting! Talking over your customers and saying how well versed you are with consumer law doesn't do anything for the money your company just scored for FREE! It is not enough to say that it is in your policy when I haven't even had a chance to read it because I've had the device for less than 24 hours. Absolutely absurd! If you can help it, I wouldn't suggest purchasing from this company at all. Take your business somewhere where your money won't be ******.