My previous employer tried to offer me a "promotion" that among much more accountability for systems also included being on-call. There were no clearly defined

My previous employer tried to offer me a "promotion" that among much more accountability for systems also included being on-call. There were no clearly defined parameters, and the real kicker was that this glorious promotion included a $0 pay rise. They were flabbergasted when I declined, and tried for weeks to get me to accept with "It will be good for your career", etc. That is a VERY hard no from me.