Technically, unless there is a law in your country that stated the loan taken from Qatar be valid in your country, then only then you will face serious problem with authority. Most of the time, the bank hires a company in your country whose only purpose is to harass you until you break. They will threaten you with a lot of legal jargons, but in reality, that's the only thing they can do. They will even hire a police officer just to make it look real that they are arresting you in case you don't pay.

However, if the bank here has a local bank partnered in your country, then that will be a different story, as they can just transfer your loan to them and let the local banking law apply to you.

No other option than to pay. If your priority is to leave, check with your local law as this may cause you more problem in the future.