Cloud Paws ongoing Vet bills

I recieved a call from my mother this morning that our families cat a 4 year old we adopted when his molther was abandoned and had kittens in our house , she told me he
hadnt been home in about 4 days, i am currently living out of state and told my mother too go look along side the road as many people in poquoson try and hit cats and sure enough they found him laying in the marsh grass  , she took him too Seaford vet in Yorktown , he does not have any broken bones but he does have severe internal trauma, the vet placed a cath too try and get him too urinate so he wont go into renal failure. The bill so far is over $800 , but we will do a payment plan with seaford that requires 1/3 down and does monthly payments so at minimum i need to raise $300 if any one can help my family will be so grateful . This huge bill is so unexcpected especially considering we are in the middle of a move and i have several bills i just had from my eclectus parrot.
I will be posting copies of eveything and attatching a link to seaford vet if anyone wants too verify anything
thank you so much <3