It has been reported that Ofcom has recieved over 1000 complaints following the CH4 big brother twist was layed upon the public.. People have both made complaints about the ex-housemate's having a chance of going back in after people have paid money to get them evicted thinking they were never to return, and the broadcasting of threats made by Grace, Nikki an Lisa on BBBM.
People are also talking about involving lawyer's and saying endemol have commited fraud by taking there money then giving the chance for the ex-housemates to return.
If u feel the need to complain (I advise you do) do it here;
http://www.ofcom.org.uk/complain/progs/specific/