My father-in-law applied for Visitor Visa on 7th Oct and the Visa hasn't arrived yet.
He applied twice in 2015 and in first case the Visa arrived in 8 working days and second time it arrived in 10 working days.
This time he applied 12 working days before his scheduled flight departure.
All documents are the same as in 2 success cases of 2015.
What are the options please?

I tried calling on 03001232241- but was on hold for over 5 minutes.
He has submitted an online email form this morning, but the published response time for email is 1 working day, which will be late.
Is there any benefit in going to Visa application centre?