The employee's rights upon resignation from a government entity

I worked for a Federal Government entity in the UAE; this entity was created by special decree so it doesn’t have a normal trade license or Labour contracts from MOL. Instead, we have signed employment contract which states it is governed by Labour Law of 1980, other federal laws and will be in the jurisdiction of Abu Dhabi.

My employment visa is from the emirate of Dubai as the entity also had a branch in Dubai. I recently resigned from my job serving 3-month notice as mandated by the HR policy. My resignation got accepted within a day and I was advised that this day would be last working day, and my notice period has been waived off.

I was just short by 15 days in completing 3 years of my service, and I had planned by cash flows assuming I would be getting paid for the next 3 months. Now, I am in a very bad situation as the employer is insisting I am not legally entitled to 3 months pay.

I need your urgent advice on the matter as the Labour Ministry cannot get involved due to the absence of labour contract.