<human>: First off, last October my husband and I bought a brand new 2015 Subaru WRX, it was a little out of our price range, but we had both recently had great promotions at work and he had totaled his car in an accident (the other drivers' fault).
  Then one day mid-December, we wake up to find the streets are covered with a thin layer of snow.  We both had to go to work, so after giving me a lecture about driving slow in the snow and ice, my husband sets out in the car.  Not ten minutes later he's pulling back in the garage because he slid into a curb going 10 in our apartment parking lot.
We got it fixed and after four months of calling our insurance and body shop every day to hurry them on getting it fixed (and several hundred a paycheck for rental cars), we are finally back in our car. 
We notice a grinding noise the first day, and a week later take it back to the shop and get another rental car (again, breaking the bank to get my husband to work).  That was in Early May; the grinding noise was the transmission, and after our auto insurance declined to pay, we submitted it to Subaru's warranty claims, who also denied fault.  Since then we've been called insurance company around every other day, but they say it's up to us to prove that the transmission failure happened because of the wreck, and a written testimony of the technician at Subaru's service center isn't evidence.

My question is; what do we do? The insurance company wants physical proof that the transmission problems happened because of the wreck, and the body shop has sent in pictures, written testimony, even their service records.  Do we call a lawyer or attorney?

Could you distill the essence of the text into 1-3 sentences?
<bot>: a 2015 subaru with 6,000 miles needs a new transmission directly following a wreck, but our insurance refuses to pay.