I bought 2ltr cooldrinks the cooldrink left a funny foamy residue on the glass

I bought 2ltr cooldrinks the cooldrink left a funny foamy residue on the glass. My whole family got stomach problems after consuming the cooldrink. I contacted one of their representatives who informed me that he was on leave but would ask one of the other colleagues to make contact I am still waiting on them to make contact and have given up hope of anyone coming back to me. I have poured all the cooldrinks down the drain cause I didn't want anyone else drinking it and getting sick. I will just never buy that brand again and I have been buying their brands from the day they launched here in Cape Town but never again they cost me alot of Dr fees.