Yes, looks like a violation. Contact a local FDCPA attorney.
The above is general legal and business analysis. It is not "legal advise" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here. Please visit my web site: www.avanesianlaw.com for more information about my services.
Debt validation isn't an impediment to a suit being filed, although it may act as a defense or a counterclaim. I would urge you to consult with an experienced local consumer attorney to assist you in this matter. Hope this perspective helps!
Just because you filed a FDCPA request, it does not bar the lender, or its representatives, from filing a suit.
You may be able to counterclaim.