Twisp faulty and then only refunded a portion.

I bought a Twisp Edge on 26th June 2015. It was leaking badly & had a burnt taste after 5 days of use. I returned it to N1 City. The sales assistant Sebastian replaced the coil & was gonna change the atomiser tank. But I was unhappy so requested a refund.<br> <br> I paid R799 (Edge E-cig) + R159(tobacco liquid). I was only refunded via EFT an amount of R424.95.<br> <br> Clearly Twisp South Africa are ******* & *****ing from the public. The support person Timothy told me they have a stocking fee of R350. Why do I have to lose money for a defective product? Is this a case for the CPA Ombudsman.<br> <br> I don't want to have to take legal action, but might be forced to if I don't get my outstanding money back.