Contact the party who delivered the writ of garnishment. In some cases, you can work out a payment plan with them.
Try to reverse the garnishment. Though very rare, this is a possibility. One way to do this is to file a "Claim of Exemption" form with the court that issued the garnishment.
Pay the garnishment off in full. This will take the garnishment away completely and is the best option available.
Wait it out. Some people chose to let the garnishment remain and continue to allow them to take wages from their check. This will continue until it is fully paid off.
Obtain documentation. No matter what way you pay off the debt, make sure to obtain final documentation that states that you paid off the debt in full.