Horrible service. Refuse to refund

I bought USB headsets (brand new) from the store. I actually asked for regular USB headsets and I was given something else that didn't work for the work equipment I had. I returned within 24 hours and asked for a refund. The staff made me stand around and kept laughing at the fact that I wanted a refund and said there's nothing they can do about it. The sales person who sold to me would have to return from lunch to assist me. I explained that my work place would give me headsets as this was the 3rd pair I bought and I kept buying the wrong ones. The manager wasn't even interested in assisting. The sales person later came and forced I took a more expensive one and paid for the shortfall. I am now stuck with headsets that I do not use and have never used. I am even embarrassed to go back to the store as the staff belittled me in front of other client's