Joe Kilgannon , 21 , and Cezanne Bannon , 19 , are suing the couple . Newport couple claim engagement was ruined by chronic food poisoning . Couple paid £ 2,000 for damages at las Bahia Principe , mad ##rid , Mexico . Thomas Cook are investigating ' at present , unsubstantiated allegations '
Joe Kilgannon , 24 , and Cezanne Bannon , 22 , are suing holiday company . Newport couple claim engagement was ruined by chronic food poisoning . Couple paid £2,000 for stay at Grand Bahia Principe , Riviera Maya , Mexico . Thomas Cook are investigating 'at present , unsubstantiated allegations '