If you have the offer letter which speaks that you have to give one month time after letter of resignation then you and the company are bound by that letter.
Second the new policy is yet to publish so apparaently you are not bound to it, but to reach to this conclusion you have to go through your offer letter carefully whether there is any clause which makes you come under bound of any new policy which gets enforced after your joining date.
So for the meantime just submit your resignation mentioning that you will be leaving after one month time as your offer letter speaks. Ask the manager to give you in writing if there is any dispute.
Second the new policy is yet to publish so apparaently you are not bound to it, but to reach to this conclusion you have to go through your offer letter carefully whether there is any clause which makes you come under bound of any new policy which gets enforced after your joining date.
So for the meantime just submit your resignation mentioning that you will be leaving after one month time as your offer letter speaks. Ask the manager to give you in writing if there is any dispute.