OP,
Please elaborate on the moving of days off. How did they notify you? How much notice? I assume they can only notify you via telephone and as such on your days on call. LAA guys make it sound like this is rare. Maybe not?...
I'm bidding long call reserve in Nov specifically to get weekends off. If they are just going to take away those days, I'd rather have a line. I literally have plans every weekend in Nov, won't be too happy if they take my days off away. Will likely not be feeling well enough to fly I'd guess...