If the match is abandoned before the end, the wagers made on that match will be settled based primarily on what kind of bet was placed. Bets that have already been determined before the end of the game (half-time betting, quarter betting, some proposition bets) will stand.
On the other side, asking the same question related to moneyline (or 1×2) bets has different answers, but it depends on the rules set by the bookmaker you’re using.