If the loan is granted based on Salary Transfer, the company that you are working for are commited to inform the bank at your end of service, the bank will call you to ask for the settlement, and there if it did not happen, then they will apply a travel ban, so you cannot leave the country.

if the bank is not informed,try to send them the installments every month by TT to your account, if in case you failed to pay the installments, then they will deposit your security cheque and file case against you in the court,so upon your return you will be arrested at the gates, if only they know where you are!! they will send the case to a collection company in that country to open a legal case, and there you should hire a loyer,the Interpol is for Crimes or large amount of money and from case to case, my advise to you is to keep up a good relationship with the bank to avoid any hassels in the future.