What does it mean when a letter I received from an attorney that says, "Move to Dissolve the Writ of Garnishment"?

Question Details:

I have a garnishment being taken out for a debt that is approx 7 years old. I had a collection agency and attorney garnish my wages. I tried to fight with a letter to courthouse asking to prove the debt. I received a letter 3 months later stating this: Comes Now, the Plaintiff, by and through its undersigned attorneys and pursuant to Florida Statue Section 77.055 files this Notice to Defendants: The receipient of notice is herby advised he/she must move to dissolve the Writ of Garnishment pursuant to FL Statue Sec 77.07 within 20 days after date in cert of service.

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