Unaware of pending garnishment

I was recently surprised by my last paycheck. I had a wage attachment for a debt owed to my previous landlord. True, I did know I owed them, but I was totally unaware of garnishment proceedings. So therefore I was unable to contest or even present to the court the reasons for me not being able to pay the debt. Is there anything that I can do since I was not served properly. The landlord, KNEW I no longer stayed at the same residence, but of course did know where I worked. So why was I not served at least at work. This seems somewhat wrong and I would like to know if it really was and if there is anything legally that I can do other than filing bankruptcy. I live in the state of Mississippi.