Not allowed to fit clothes at Cotton On Mall on the South.

I am so highly disgusted with Cotton On Mall of the South, Gauteng, South Africa. I wanted to fit on two bikinis today and was told I am not allowed to. Iam also not allowed to return bikinis. The managers reason was that she has four bikini bottoms with blood stains on. I asked her so what must I do? Should I just buy the bikinis and if it doesnt fit buy another size? She had no solution. This is absolutely rediculous. Just Because her fitting room people do not check the items once a person leaves the fitting room now all the customers are being denied to fit bikinis.