Getting billed exorbitant for being Human

On our way home we were traveling next to an S.U.V towards robot when he slammed on his brakes,i felt a hit and upon looking back saw a dog tumbling,i stopped to see what we can do, when a homeless person came walking up to us and told us it is his dog,we asked him where is the nearest animal hospital and he said we must go to the horse stables,they referred us to Ixia street . got there, spoke to the Dr. he wanted thousands to do xrays and more, they phoned SPCA and AAC who both said sorry they cant help they are closing, at the end decided because we don't have money to have the dog euthanized as i drove over her and did not know the extend of her injuries, being good people we said that we will pay for the injection,we ended up paying R1120. i feel that it is so unfair,that after we told the dr that we dont have money and it was'nt our fault,it was an accident.what would of happened if we drove off,or just left the homeless man there with the dog,we were in such shock that we paid with our credit card but, i am sorry i want my money back,how am i going to survive the month, we were being humane as we are both animal lovers and wanted to help the dog out of his pain.<br> ,