http://www.usps.com/forms/_pdf/ps8165.pdf
If you have paid anybody for items on this forum and you did not recieve your payment, and any part of your transactions were done through the USPS (ie- mailed a check, paid with postal money order, anything in the mail) you can fill out the form linked above and send it to be investigated. **This is not for menial things, this is for serious happenings only**
Print and fill out the form and mail it to:
INSPECTION SERVICE SUPPORT GROUP
222 S RIVERSIDE PLAZA STE 1250
CHICAGO, IL 60606-6100
If they recieve your form, they will have an investigator investigate what has occured and if there is any wrong doings, they will right them.