Thank you so very much for your reply. Is there any way we can write to the UK home office (any email address or any contact)? The only way to contact the ukvi is through telephone and it is not really helpful. https://www.gov.uk/contact-ukvi-inside-outside-uk/y/inside-the-uk/visas-work-study-and-ex...

Hello, I am final year PhD student currently on TIER 4 visa. My TIER 4 expires in January 2020. Recently, I got postdoc offer from the same place where I am currently studying. In July 2019, I applied for the TIER 2 visa (switch from TIER 4 to TIER 2). At the time of the document submission, I was g...