If you purchased the camera, mount, and SD card using a good credit card, sometimes they have accident/loss/theft protection, usually good for up to 30 to 90 days after purchase and regardless if it was your fault or not. Look through your credit card terms of use to see if you have it, then call the credit card company and report it. Give them a description of what happened and that you tried to work it out with the manufacturer but didn't work out. They may give you a refund for your cost. If over that period, many cards will have extended warranty benefits and you could try it that way too through the credit card company.
If you bought it through a store or place like amazon.com, then contact that place to see if they would replace it.
If you hire a lawyer, you'd spend $1,000 for a $50 part. And lose.