You could give them a choice. Of course not all the guys who are blocked by Big Point can come to the Forum or have any way of communicating with you at all.
You could give Big Point two weeks to get the problem fixed and get the guys the ability to log back on.
After that the guys who can't log on could either keep arguing with Big Point, or set up a new account with Days of Evil, which would be mirrored with their old account that Big Point has broken. You would have to let Big Point know which Accounts have been mirrored or just Delete them after they are mirrored and let Big Point figure out which ones are gone.
You guys can decide what kind of compensation should be worked out or tell Big Point they need to refund any money the guys who aren't able to log on from Big Point have paid. After all Big Point has not met their obligation.