No, a quick call is not a courteous first step when someone tells you that you've destroyed 20 years of their work and they no longer want to have anything to do with you.

Suggesting that such an offence can be resolved by a "quick call" is extraordinarily disrespectful. A courteous first step would have been to apologise profusely, revert the damage that the bot did, and ask to set up a call to discuss what it might take to re-enable it in the future.