False advertising

I brought Coverderm from Norwood Mall Dischem and was told that it lasts 24 hours, gives full coverage and is waterproof. This is not true! I app**** it and gives light to medium cover...is NOT waterproof and after 1 hour the foundation was patchy and barely visible. I am very disappointed. I would like a refund as spending R500 in a product like this is not right.