Says TMZ:

Bam Margera going to rehab has a celeb boxing promoter in a tough spot — he’s looking to get back the dough he just fronted Bam to ref a high profile match.

Damon Feldman, the promoter putting on a bout featuring the infamous Bagel Boss, tells TMZ … Bam got half of his fee up front — a cool $2,500 — after signing a deal last week agreeing to be a ref. The deal called for Bam to get another $2,500 after the event. Damon says he hopes Bam gets better soon, and he won’t won’t hold the “Jackass” star to his contract.

The only catch … Feldman says he wants his money back.

The “Viva La Bam” star is spending the next 60-90 days in treatment, meaning he’s unavailable for the September 7 event in Atlantic City. Damon says he’s contacted Bam’s team to get the money back, but so far, radio silence.