At my old company, the contact said - up to one year - one month notice, there after 2months.

I think they probably want to to work through Ramadan otherwise they will be short staffed. Technically, the company will be responsible for anytime they keep you over your RP expiration. If they renew its their cost.

I understand that you want to go now, but what the harm if they want to keep you till Septmeber, its only 2months away.