Sadly we often don't know we're being screwed until we accidentally find out others aren't.We did get a bit of a refund. Now everybody uses the small truck service.
I was paying almost $4.50/gallon for propane. Found out last year someone I know 25 miles south was paying $3.50 from the same big company for a lot less than I use annually.
Called the local office and asked about it. They dropped my next delivery to $3.50 and credited me $1/gallon for the prior delivery. Last May they put me on the advance purchase program ... about $2.50/gallon. I figure I've been screwed out of many, many thousands of dollars.