For having availed loan, it becomes your duty to repay the same.
You cannot escape the legal liability.
If you do not respond to their demand to repay the loan amount, they may initiate suitable action for banning your entry into that country owing to your irresponsible attitude and cheating character by which you have cheated the bank by not repaying the loan.
A criminal complaint agaisnt you may put inside the prison sooner you land in that country once again seeking employment opportunity.
Better write to the bank explaining your current poor financial and helpless condition and can assure that you shall repay the same soon by buying time from them for repayment.
Legally they cannot do anything while in India but this cannot be a permanent solution to your crisis.