Rebel Wilson says she's dealing with multiple lawsuits ... and now she's firing back at the man she says is funding them. Rebel went OFF in a series of posts on her Instagram Stories, slamming billionaire Sir Len Blavatnik , alleging he neglected to help her when she called out what she deemed to be bad behavior on set. Remember ... Gregor Cameron , Vince Holden , and Amanda Ghost -- producers on Rebel's directorial debut "The Deb" -- filed a defamation lawsuit against Rebel after she claimed

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