Genoa, February 20 - Italian labor unions in the northwestern city of Genoa have called on citizens lining up outside their offices to sign up for a supposed IMU tax refund to not do so. Three major trade unions - CGIL, CISL, UIL - issued a joint statement saying that their facilities and tax-assistance centers are inundated by people who misinterpreted a pre-electoral letter sent by ex-premier Silvio Berlusconi promising a rebate on a housing tax if elected. In the letter, sent to millions of Italians on Tuesday, Berlusconi promised to scrap the much-hated IMU property tax introduced by his successor, outgoing Premier Mario Monti, and give back the money paid in 2012 if his centre-right coalition wins the election. However, many believed the rebate to be a done deal when they received the envelope stamped "rebate enclosed". The trade union message said "in order to avoid wasting time, we invite citizens not to come to the union headquarters because the letter is simply an electoral message".