I work for a marketing company that staffs various events. Our regional manager keeps getting changed for some reason. The new one I’ve had difficulty with. On several occasions she just ignores my messages. For the past several days she said I have a shift today. She just sent this in a text message but it isn’t on the official system and I have almost no information about the shift (such as the time). I contacted her several times to get this and she just said she would do it soon. Finally she gave me the time and it was only 3 hours before the shift started. She has done similar things.
I would l like to speak with her manager but not sure who it is. I have a guess, someone included in some email chains. My question is how should I approach it?
I could email the person I suspect of being the manager "Hello, I work for Ms. Manager in location X. I was wondering if you’re her manager or know who is?"
In future situations like this what should I do? If she hasn't provided me with the necessary information 2 days in advance I could find other work but that would mean missing my shift with them. This is a real problem her not using the official system because now I can't check in when I'm at work.