Olay review: Olay body wash

I purchased several weeks ago two Olay body washes, Olay with niacide and Olay with collagen. I purchased both because I could not decide which one to get. I’m sorry that I did. I purchased these from a chain drugstore. I have never even considered why anyone would return to the store a body wash, so I didn’t save the receipt. I started using the Olay with niacin. My husband asked what the tiny black marks on the tub were from; I told him that I had no idea. My wash cloth had purple stains on it. I tried both body washes and found they were the cause. They are very difficult to scrub out. How do I get a refund. I am too old to be scrubbing these stains..