Need help garnishment questions

I made "arrangements" to pay on a very old debt because they were going to take me to court and I was caring for my sick mother. I signed papers outside the courtroom just to get it over with, even though I originally only awed them about $1200.00, the upped the total to $4400.00 They filed a judgement against me even though I was making payments.This was back in 2004. I was paying regularly & on time. I only owed them about $2,000 when my mother suddenly died in April 2006. Needless to say I was devastated and it took me a year to handle her personal affairs. We lived in Florida at the time. We moved to Georgia Dec. 2007. Because I was so distraught over my mothers death I basically had to pack 2 households to move. Since moving to Georgia I was unable to locate all of the paperwork that I had concerning this debt. I have since received paperwork from another attorney and the judgement has been filed here and now they have started garnishing my income. Out of the $550.00 bi-weekly that I take home to begin with (after taxes, ins, etc) I am now taking home $357.00 every 2 weeks. That is outrageous!! Not to mention I am back up to owing them $4500.00 dollars - yet again. They never contacted me here in Georgia about my payments and I could not find all of my paperwork. I did however go back in my check statements with the bank to see how much I had already paid them. They did finally send a certified return receipt letter and then I received a letter from the court also, but there was nothing in it about a court date to show that I had paid and to explain the situation to a judge. After them already charging me all over again I thought I would have an opportunity to at least speak with a judge about it but that wasn't the case.
So, now that you know where I am at with this....is there anyway in the world that I can send a letter to the judge, the company(Asset Acceptance) and my employer to get back to making the payments I was making. There is no way in the world that anyone can live on $160.00 p/week. Please someone can you guide me regarding this matter? Do I have any recourse??