Back in the day bookies used to offer only spread, moneyline, and over/under on most games. There was no with OT or without OT. If you bet a team -3 and the team won by exactly 3 the bet ended up being a wash.
Nowdays they have added the draw option in there and if you bet team A -3 and they win by exactly 3, you are a loser. You should have bet on Draw to win. It's a little shady IMO but it's clear. It gives the casino a little more house advantage is all i'm saying.
I don't think it's fair to title your thread "DO NOT BET ANYMORE ON SPORTSBET.IO, wrong bet decision on unusual match" when it's clear that you do not understand what happened even when people are trying to explain it to you. Yes, it sucks, but you should be aware of the rules of a match if you're going to make a bet. The bookie themselves did nothing wrong here, if you want to be angry or disappointed, you should direct your frustration to yourself for not knowing the rules.