How can I respond to a debt collector regarding an old medical bill on year 2011?

I recommend discussing this with a consumer protection attorney. He or she can let you know how best to proceed.

I am full legal guardian of 20 year old autistic son. Is he liable for debts he has accumulated on his credit cards et al?

Generally speaking, if you were the guardian of his person and property at the time he incurred this debt, his guardianship estate is not liable...

What happens with a Continuing writ of garnishment after 179 days have passed?

I recommend speaking with a local bankruptcy attorney. That may be the only way to get this to stop.

What will happen to a bank loan I have of 3,500 dols filling a chapter 7 with my dad being a cosigner on the loan.

Your bankruptcy will not protect your dad. His guarantee of the loan remains.

How can a collection agency put a derogatory mark on my credit when the bill was in someone else's name...

I recommend speaking with a consumer protection attorney. He or she can best let you know how to proceed.

Can you sue someone if they post your name on a public highway, on a debt they have not proved.

Perhaps. It depends on the details. Speak with a litigation or consumer protection attorney to find out what you might be able to do.

Check with your payroll department; it should have a copy of the documents imposing the garnishment.

Do you have to be notified first of a hold being put on your bank account by a collection agency

Generally speaking, yes, it's something they are allowed to do. You may want to speak with a local consumer attorney to see if there's anything...

Why haven't I received my money back that was garnished from my wages after winning exemption in court in July ?

I recommend speaking with a consumer protection attorney. He or she can best let you know how to proceed.

Can I force a creditor to send my I information to collections in order to stop them from adding a percentage to what I owe?

I agree wit the other attorneys' excellent answers.