Police will tell you it is a civil matter, as such, there is nothing that they can do. BBB are toothless and cannot do anything. Small Claims is the only course of action, it will cost you the filing fees but will 100% guarantee the satisfaction that you want. Once this satisfaction has been gained (pending that the side of the story you present is accurate and theirs is not), then you can tell the BBB that the issue has been resolved.

One of two things are going to happen, they are going to agree with your claim and pay you in full or product in lieu of. Meaning the price you originally paid + all court charges. Or they are going to fight you in court if they have a different perspective on the story. From what you have said, it seems rather cut and dry but there are always two sides to every story.