Complaint Review: AT&T - Cingular

I am very upset to find that just when I'm ready to start working on my credit report to get it all cleaned up, I find two very high amounts on there from two companies I have never done buisness with.
AT&T is on my credit report saying I owe them $1,057.00
Cingular is saying I owe them $1,507.00
Now I'm getting alerts from Equifax saying a company by the name of LDG is trying to add more debt to my credit report in the amount of $664.00. I am doing what I can to get this cleared up, however it is very hard to find the time while being a single parent, working full-time and going to school.
I just don't understand how ease it is for these people to put things onto my credit report, but it is so hard for ME myself to get these things off because these debts don't belong to me.

Sweety
St. Paul, Minnesota
U.S.A.