This is so depressing - it cost him $200 to get to the point of arbitration in the first place (lucky for him that he had $200 to file it in the first place), _and_ he didn't even get the total amount back, he get less than $1500 rather than the $200 he likely should have got.
For anyone who claims "just take them to court" or "just sue them for breach of contract" - this is what you're looking at, getting back 75% of what you expected after paying for their complaints procedure.