Long life milk full of black mold

I purchased a litre of low fat long life milk from Woolworths in Equestria which was due to expire in April 2015. When I tried to use it this morning, it was FULL of a black mold/algae like substance. This is unacceptable and a potential health hazard. This should be investigated as it may be an issue with the bottles or the milk may not be pasteurised properly because I have NEVER seen this happen to milk. Needless to say, I will never be buying milk from Woolworths ever again.