Better World Books / Sales Practices

Don't buy from Better World Books! I bought a much needed text book. They sent the wrong edition. When I contacted them, they didn't have the edition they advertised and told me to send back the book BEFORE they would refund my money! They are schamers! They advertise a popular text book, send you an outdated text, refuse to refund your money until YOU, at your own expense, return the unordered book. WHAT assurance do I have that they will EVER return my money?
Pua