Still waiting on my return from 2013

Long story short my wife passed away at the beginning of 2014 and I had to quit my offshore job to raise my then 2 year old daughter alone. I filed the return like normal with turbotax and followed the instructions to file married joint. I called after the 21 days checking on my refund and something was wrong. Since then I have received four notices saying the department needs an additional 45 days to research my case? Here I sit at the beginning of this year and still no return. I have called at least 10 times and each time I wait on hold for over an hour just for them to tell me there is nothing they can do and I have to let the process play out. Is there anything I can do? Should I be paid extra interest for them holding my return for so long? Lawyer up? I'm fed up and looking for answers, please help.