I was rear ended

I was rear ended two weeks ago and I am just now getting a rental today and the at fault party's insurance company told me that I am responsible for the towing and storage of my vehicle when the only reason its been sitting that long is because I have been waiting for them to contact me b/c everytime i have called I got no answer except the first time I called to file the claim and was told that they had no knowledge of my accident. Am I really responsible for the fees? If my car is totaled why do i only get a rental for five days?