App is broken and is selling data to retailers

I used this app for weeks and it simply doesnt work. They told me Walmart owed me money. I drove 60 miles (closest Walmart) only to find that I am in fact not eligible for a refund and they even laughed to my face when I showed them Windfall. I have friends in the industry and they told me that Windfall and others sell data to marketers and retailers. Im deleting this app. Stay away from this!

Heyita about Windfall - Save Money After You Shop