Signet Financial Group PO Box closed, unable to mail in refund request Vacaville , California

We carefully followed instructions to receive the refund for our unused car warranty, but the letter was returned, marked as "PO Box closed, unable to forward, return to sender".  The phone number we called said,  "To find the best rate  to refinance your loan or save on a new loan, call Freedom at 1 800 220 1500, that's 1800 220 1500."  Then it hung up.  That number is for a mortgage company. 

We read the fine print.  Upon purchasing the warranty, we signed to use arbitration to settle any disputes.  It says disputes will be settled one case at a time, and that no class action lawsuit may be used.  It also says that arbitration must happen in Solano, California.   

The website for Signet Financial Group is "under construction".

Oh, this makes me want to be sick!  We were counting on that refund. We would never have bought the warranty without the refund promise.