How to remove Apple Account without password and trusted phone number?

You would need to provide your original purchase receipt and follow the steps to remove the Activation Lock. It is likely that the purchase receipt will need to be from Apple and Authorized Apple Seller and that it shows your name and serial number of the device. Apple doe not get involved in third party sales, so any other receipt will likely not be accepted.

https://al-support.apple.com/#/additional-support

DO NOT enter private details, Contact Apple support via https://getsupport.apple.com and choose your region, or call Apple Support