Or: if someone is accusing you of gender based discrimination, assert that you will be hanging up ( politely ) and switch to a recorded medium, where the first

Or: if someone is accusing you of gender based discrimination, assert that you will be hanging up ( politely ) and switch to a recorded medium, where the first thing you say is: “you accused me of <gender based thing here>, I don’t think this is fair because <airtight reason here>”. Boom, documented. Note: if YTA this may work against you. Either way the NTA has the documented proof they need.