Don't get mad, get even. Vote with your wallet and shop elsewhere.
If you can't boycott, then at least reduce your shopping done there. Do not go week after week to a NTUC supermarket and fill up your cart or trolley with its goods.
I have said before: had it not been for PAP patronage, NTUC supermarkets business would have never grown as big as they are today. And they also own the Cheers mini marts. This shit only happens in Sinkieland, remember their previous attempts to open supermarkets overseas always ended in failure.
Give me AEON or Tesco anytime. Giant also gives good deals.