Fungus

I purchased the Albany rolls best of both on the 14th of April. On the 15th when I opened it it was green...fungus. the expiry date was the 17th of April. Unbelievable. As far I can understand even if the bread is expired it will never go green. It's the first time I have experience bread going bad before the expiry date. How disgusting. Not going to take a chance with it again.