If my only income is Social Security Disability is protected from creditors by federal law?

I am totally disabled and can not work. A law firm trying to collect a debt of two year old credit card. My only income is Social Security Disability. Does the federal law protection of my disability pension? If so, what should I write to lawyers to stop his letters demanding payment? My accident (and the determination total disability) occurred after the charges your credit card.

I just read an article about what I'm going to participate. He said that no creditor (Excluding government) can decorate if you get social security. You should write a letter to the creditor and ask them to stop contacting you. Legally, it must stop.

Disability Workbook for Social Security Applicants 7th Edition 2008 $19.95 Disability Workbook for Social Security Applicants (7th edition, Rev. March 2008) by Douglas M. Smith, Attorney at Law Review: More than two-thirds of claims for Social Security disability are denied in the initial decision. In this updated Disability Workbook for Social Security Applicants, experienced disability lawyer Douglas Smith guides applicants through the process with the goal of…

Attorney’s Guide to Social Security Disability Claims (Regulatory Manual Series) $110.00 …

Social Security Administration paying attorneys who represent disability applicants : statement of Barbara D. Bovbjerg, Associate Director, Education, … (SuDoc GA 1.5/2:T-HEHS/AIMD-00-166) …