إرسال خطاب الاستقالة ورفض صاحب العمل الرد

Greetings,

They can't keep you more than the notice period as per your employment contract.

If they will refuse to pay all dues, you need to file a labor complaint in MOHRE, or in a labor office if it's a free zone.

Also, you can request a visa cancellation in this complaint. Only you need to make sure that you have the resignation letter you sent to your employer by email as you need to have evidence.