baklava
I don’t work at UPS anymore.
Another thought on this - if a driver in my center had grabbed a steward and done as you say I would have documented the conversation in his file and had the steward sign it. He would now have given me free license to pass him over when offering extra work. I'd still call if I was desperate enough - after which he might file a harassment grievance against me which would have been a nice feather in my career. In 13 years in management I never had a harassment grievance filled against me and I know a couple division managers who would have looked more favorably on my career if I had.
Why would you want to surrender your seniority rights when all you have to do is not answer the phone?
I actually agree, no need to escalate the situation with a steward unless he feels management is pressuring him to answer their calls.