I work for a cleaning company for 3years and 9 months as a mobile cleaner,I have a company car and I drive all day around contracts to clean,I'm on sick note since oct 17,due to Vertigo I can't drive or do the work I used to.My Doctor has given me the fit notes and I send themto office ,today I have got a letter from them saying they want a meeting with me.Can they fired me even on fit note?