Sounds eerily like the time I shot some rollei nightbird. Though its c41 and a redscaled film i had the same result. Heres the kicker, it says expose at 800. Knowing its redscale i shot it much slower because its nearly impossible to overexpose redscale. 2 weeks of shooting, going places, great shots ruined. Film was pretty much transparent with the exception of 2 feint frames at the beginning of the roll.
My conclusion, rollei films are not to be trusted.
Do you have any rodinal around or anything you can stand develop with? You should be able to get a result with that, then determine if rollei is shit or massive dev chart is wrong.