I found Black Stuff inside the coke

I bought 500 ml coke at spar in Ruimsig..I did drink the cold drink without noticing the is black things inside the coke, when it was half I realised the is a black thing on the side of the bottle inside, then I did hold the bottle straight I found black things, which am even scared as to all along I have swallowing things that I don't know what if they will have negative impact to my health this so disgusting.. I still have the half coke. And I was not even eating anything.. Am very disappointed and worried about my health, not knowing what I drank..<br> <br> Can someone get back to me, regarding this matter. Cause clearly our health they are no safe