5 min fence stain covers 300 sq feet per bottle, Internet

i ordered three bottles of "5 min fence stain" from the internet. the company shows a video of how easy it is to use and how you can paint/stain your fence in 5 mins. they claim it covers 300 sq ft per bottle. it did not. i did everything it asked me to do to prep the fence. I hooked  up the bottle and started to paint with it. I covered 4 8x6 ft sections of fence and the bottle ran out. in my math that is 128 sq ft. not even close to the 300 sq ft they claim.  i have written them two times via email and never got a response from them. I wanted a refund on the two un-opened bottles.