Ban appeals for the RL Garage website/app are exclusively handled through our support ticket system. Please create a support ticket on https://rocket-league.com/support and our staff will take a look at your account to see if there's any reason to unban. Creating a support ticket is no guarantee that your account will be reinstated.
PS: RL Garage staff will never ask you for your password, please report users claiming they're staff on RL Garage asking for your password.