Unless your book/bookie is a real dickhead hardass they should cancel that for you.
My situation it was just crypto and they said they can't reverse it.
yes, we all have
and when you bet wrong, how come it rarely ends well?
the gambling gods are cruel
"rarely" is generous. Try NEVER
No but I've bet the wrong side before a couple of times, and just bought back the other side at twice the bet. Was mad at myself for eating the extra juice knowing it probably killed any advantage I thought I had.