Hello,
Further to what Dinesh Divekar mentioned, what are the Standing Orders in your Company?
Generally, in most large Companies, any long leave [definition of 'long' can vary from Company to Company] is to be availed only AFTER the concerned Functional Head approves......NOT just the HOD.
And in cases where overseas travel on personal grounds is also involved, the Approval process usually has to go further higher.
However, based on what you mentioned about the Company looking for ways to pack you off [whether rightly or not], MAYBE it COULD be for your own good, in the long run? Just give this a thought.
With your experience of 27 yrs in the Construction sector, I am sure you would be able to get another job that are better paying & with higher responsibilities--at YOUR comfort level. More so, with the construction sector in India likely to go up, this is a very viable possibility.
I would suggest that you ensure you get your dues completely & look for other openings--you can sync your efforts with your date of return to India. If they figure-out that you are serious to move out, getting your dues [which I am sure would high, including Gratuity] may be smoother.
I can recollect a Quote by Alexander Graham Bell [the inventor of Telephone]: "When one door closes, HE opens other doors for us; but we so often miss seeing them as we keep staring @ the closed door".
All the Best.
Rgds,
TS