Sour ultramel custard

Good day I bought a box of ultra mal on Sunday morning at ywayelani super market for dessert after our sunday lunch.

At about 6pm I poured the custard in the dessert Bowles and gave some to my younger son who is 2year he throw up and I tasted the custard it had a foul fast and there was a chick slim thing in the custard that had a black greenish colour

I always buy custard for my children I'm very disappointed with this custard it's old but yet the expiry date is 06/04/2025

I will attach pictures my child isn't well because of the custard he is queezy

Kind regards Simone