Very concened...Is Coke safe for human consumption?

Last week we bought a crate 1.25L glass bottles of Coke only to realise there is a milky/oily type substance in 2 bottles. These are sealed bottles! This is very disturbing as we don't know how many of these bottles contained this substance, as we drank 6 bottles already. Have we been exposed to a poisonous substance? I have kept the 2 bottles aside and would expect Coca Cola to take ownership and investigate the matter. I await your urgent response.