Samsung — Gas filling charges for under warranty compressor replacement

Samsung Service Centre has charged gas filling charges for under warranty compressor replacement and also replaced PCB stating that compressor is damaged due to fault in PCB. They have not shared the invoice copy also.
Date of service request - 11.06.2021
My Service Request No. - [protected]
Serial Number: R5754PAD900682L
Even invoice copy is not available online after login on Samsung portal.
Also got a unjustified reply from Samsung customer code, it was informed that they don't have record of invoices & gas filling charges information.
These information should be available to customer. I have paid Rs. 1800 as gas filling charges for under warranty compressor replacement.