Porsha Williams’ estranged husband Simon Guobadia is dragging her former boss and two of her banks into their bitter divorce battle. Legal documents obtained exclusively by RadarOnline.com reveal Simon subpoenaed the production company behind Dish Nation, Bank of America, and City National Bank to sit down for a videotaped deposition about Porsha’s finances. As this outlet reported, The Real Housewives of Atlanta star filed for divorce from Simon in February after 15 months of marriage. The exes are locked in a nasty war over their prenuptial agreement. Porsha demanded the court uphold the con…