How about the other FT's at that school?Have they not been paid for four months either?
You and your foreign colleagues should first form an 'association',then give the employer a deadline, threatening to go on strike if your salaries have not been paid on or before it.If still no joy,you should carry out your threat, and then inform the local newspaper of your plight.
I suspect you won't be 'a poor teacher' for much longer.Odds on, you and your foolish foreign colleagues will be paid before the deadline has expired.