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KRAMER, LINKIE &  TAYLOR, LLC

GEORGIA OFFICE    FOUR PIEDMONT CENTER, SUITE 205  3565 PIEDMONT ROAD, NE
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DISTRICT OF COLUMBIA OFFICE   9210 CORPORATE BOULEVARD SUITE 350
ROCKVILLE, MD 20850   TOLL FREE: 877)745-9562   LOCAL:  (240)880-1606
A free lawyer at a public agency represented a buddy against what must have been the same bunch as this when some or all of them were called Mann Bracken before it got run out of business.  
He put my friend savvy to a device known as the "debt validation letter" for use by people that find themselves  up against this and similar outfits but that don't have access to a lawyer.
What you do is google   debt validation letter   and when the samples come up pick one out and copy it making needed changes as to to and from etc and fire it off registered or certified so you can show you did send it if and when it actually gets to court and as happens in 99% of cases the bottomfeeder plaintiff is clueless as to the history of the debt the case will be thrown out,