Poor service at Valpa gas

I bought a gas cylinders with gas , when I got home I realized the cylinder doesn’t fit on my heater. I took the cylinder back for a refund cause on the slip they said they do refunds provided the slip is available. When I got to them they told me they can’t give me a refund because I took the gas home. The information on their slip was obviously misleading and the attitude of the stuff was very disgusting and I’m pretty sure should I have been a white person I would have gotten better treatment! This kind of behaviour is unacceptable and so pathetic. I’ve been waiting for their manager who’s been on lunch forever! I suggest people take their business else where