Mahube valley owner is the worst

I bought a gas heater before end of July at the mahube valley Kit Kat when I I tried using it the heater did not work I had to travel back when I got there the person helping told me I will not get a refund eventually they gave me another heater when I got home it also didn’t work when I returned again the owner this time was rude and dismissive told me I won’t get a refund or exchange I’m stuck with a heater that doesn’t work I don’t know what to do I still have the slip please help