No!

now that you finally gave him a deposit, I'm sure you guys communicated a completion time. (right) With that being said doesn't give you the right to blow up his phone slowing him down. He's probably not returning your phone calls cause he's working on other peoples things that gave him a deposit and if you thought his communication was a problem before you should have not left your bear with him and or it could be bad communication!! A Taxidermist should never start any project without 50% down period if they do and I do sometimes that is just bad business. There is a lot of work, time and money that goes into a mount long before ever putting together. I sometimes take things in that the people don't have the money to put down at the time of drop off, so we put it on our contracts and your taxidermist who ever he/she is if they are legit should have one and how things work. Good luck!!