My question involves judgment recovery in the State of: Georgia

I have been served garshishment papers by a junk debt buyer on a summary judgment which was obtained against me in December, 2006 after I failed to successfully defend myself ProSe. Since that time, they have also inflated the amount of the debt by $5,000.00. Two questions:

1) How did they come up with $5,000.00, and:
2) What is the legal limit for garnishment in this state?

Thanks