not enough information on credit report

I just recently got my credit report and there in 6 different collections on there with no phone numbers not even the name of the collectors or creditors no information that would help I just recently decided to take control of my credit how do I do this with out knowing who these people are who say I owe them money it looks something like this
Collection(499ydoc789w) half an account number and a dollar amount that I owe but i dont know who they are and have no number to call and check it out or pay them! please help I have no idea what to do or should i just dispute this