pool cover inverted

I ordered a pool cover for a rental home in Colorado a couple of years ago.My tennants said the poolcover was inverted,as I was not living in the house I never really opened it up.

After close inspection I noticed it was inverted so I called Judy and tried to resolve this issue but now they want me to pay them to correct their mistake. The cover cost inexcess of $1500.00. I think they should correct their mistake.I now have a pool cover that is absolutely useless.I also own a business but I have never treated any of my customers like this. I would refrain from doing any business with a company like this.This is probably the worst example of a business on the web.