Wow, so sorry that you have to go through all that hassle and drama to get this settled. But at least Paypal is working on your side. I think I'd resolve this quickly myself. Send it back, get your money back, and get another gimbal from a known reputable source.
While you are waiting, keep doing what you are doing to spend time with your dad. Time waits for no man. I lost my dad to lung cancer and emphysema many years ago, so ANY time you spend with your dad now is important, no matter WHAT you are doing.....even if is only talking over a cup of coffee.
Check around on the Forum for the part you need. I'm sure someone like
@hunch from uavrepairshop.com (or others) may have the part you need and can get you back in the air soon. Good luck. [emoji106]