FLMA Problem

Hello. I requested FLMA leave 1/4/2010 the beginning date of a medically documented back injury(5 days off from work). Aetna( Boeing Rep Company) mailed the medical documents to my home. I didn't rec them til 1/14/2010 via US mail. I then visited the doctor to filled the forms out on 1/19/2010 and faxed back that day. My claim was denied stating I missed the 15 day window to return the documents. After numerous attempts to correct this they still denied my claim. Additionally, I spoke with Aetna on 1/11/2010 and stated I hadn't rec'd the docs yet and they said to look for them as they were mailed from Florida to Washington state. Not once was I ever told there was a deadline for submitting. Do I have legal recourse? Also is the law 15 days from the request not including the actual informing date? If so then the 19th is a valid submission date???