visit visa expired!!!!

hello everyone!!! i am mom of 3 and i have taken 2 of my kids with me here in qatar on a visit visa. their visa have expired since last dec 19, but thru some help from friends i was able to extend it until the 16 of this month...the last time i asked for an extension i was told it was final and i couldn't come back to ask for more, i was even asked to sign a paper in arabic that i will be responsible for making sure my kids left the country after the said date...my problem is both my kids are studying here and its almost the end of the school year, if i send them home now, no school from my country will accept a transferee. it means my children will have to lose a year of school and they'll have to repeat it once more...i tried get a sponsorship of my kids thru the dept of labor but twice they denied me...i was told that it should be my hubbie to sponsor our kids, but the thing is, he is a newbie in his company and what's worst they refused to give approval for him to sponsor his kids, citing his low salary and he is barely 4 months with the company...can somebody please help me...direct me to what, where, how and whom else can i go to for help.... many thanks....