There’s a load the umpire can do, and in fact did do, he showed one pair a black card and as such DQ’d them, however that was then rescinded!
It was obvious what they were doing but the whole set up of the competition was ludicrous, any team that had won it’s opening two matches didnt need to win their 3rd (roughly) and as such they’re going to play it tactically.
Sucks for the spectators that want to see a competition but the fault at the end of the day has to lie with the authorities that put in a tournament that was so obviously open to ‘abuse’
If we’re equating it to other sports then imagine a swimmer that’s already swam the qualifying time being asked to race another heat…