Most betting sites state that cancelled or voided bets will payout at a rate of 1/1, or be returned. With an acca, the selection will turn your bet from a treble to a double, a quadruple to a treble, and so on.
If a match is not finished, Betway will typically settle any results that have already been decided, while the remaining bets will be voided. So, punters will not be able to win or lose any money. However, the good news is that they can use their returned tickets on future wagering opportunities.