Wrong sizing and no return!

Extremely disappointed in the swimwear I received. I bought a size SMALL but what I received wasn't a small at all. It fits a large person. This is unacceptable, and now all of the sudden I can't return it! This option was still available when I bought the item. The size label has also been cut off, probably on purpose to cover up! What am I suppose to do with this big swimwear???!