There's a scandal on biggest Russian betting forum "BYW". A customer of Fonbet had his parlays on tennis voided by the bookie after event due to one match that was suspicious to be fixed. But in the results page of Fonbet there are no cancellations of this match, it was printed with its result what means the bets on this match were settled according to its result... but only ones which lost!
Not only Fonbet just voided the winning bets on this particular match, this bookie voided WHOLE winning parlays where it was included!