Bad checks on packaging as foreign items are found in sealed coke products.

I bought a pack of 2 liter coke soft drinks at Pick n Pay in Jane Furse. Upon serving two of bottles to our guests we discovered some floating items and had to discard the two bottles as we did not know if those foreign items are harmful or not. When I checked the remaining bottles, similar items are seen in all the bottles. How does one share a coke moment with the loved ones when such items are found in the sealed packaging? Clearly the correct checks are not done to ensure that all products are consumable.