Health hazard for healthy food

You know frys is so expensive but I've purchased from shoprite and checkers and for 2 or 3 months now there's been black or green mould on the hot dogs... I don't know what is going on this is so unhealthy... We normally just fry our stuff trusting that the hit dogs is good but what happens when we eat the moudly food.. It's really disgusting and a neatly hazard