Unprofessional

I'm a regular customer Clicks centurion mall . I bought Russell Hobbs SA iron on the 09th of may 2022 unfortunately I lost the original slip and the iron wasn't functioning well. Today I went to clicks centurion mall to return it and I've never been so humiliated... I explained to them that the only proof that I have it's bank statement and my clicks club card can also proof that I purchased the iron from them ..but then still my rights as a customer were violated as I was FORCED to take a brand that I did not want .. The manager refused to give me gift while they were busy making fun of me , talking nonsense that I don't have a slip bluh bluh... I'm now stuck with an iron that I don't like .. is it fair though???? Paying for something that I don't like ?