I am a Turkish citizen who has been living in Bangladesh since 2010. I have residence and work permit and proper visa on my passport in order to stay in Bangladesh legally. I did apply for visit visa for the UK through the VAC (VFS Global, Dhaka) on 6th July 2017 and on 31st July 2017, I have received back a pack from the VAC with additional letters inside but the passport, stating that my travel document is invalid.
My passport was renewed by Turkish Embassy in Dhaka on 31st March 2015, and with validity for ten years. Accordingly, I have visas on it, staying legally in Bangladesh with a work permit, and traveled to Germany, Netherlands in March 2017, India in May 2017 and USA in June 2017 for an official purpose from where I returned to Bangladesh just before 12 days of submitting the passport for a visa at UK VAC.
How did they decide that my passport was invalid? If we assume that my passport was invalid what is the next action to be taken by British High Commission? They didn't submit my passport back,where is it and where can I get it back from? I badly need answers of these questions.