I would like to add that unfortunately nationality IS an issue. There is actually a different quota on dependent family visit visa (e.g. parent/sibling/relative etc). Also who is your employer or sponsor matters (as NOC and employment contract is required).

Often these things will sway the captains decision in your favour. I have also previously succesfuly applied for visit visa without baladiay stamp on rent agreement, but sometimes they ask for it.

You can try diff. dept. and try again (with baladiya stamp). Hopefully you will find success and get a visit visa for your parents.