With regards to your first question it will depend on whether you finalize the order or not, if you just extend the resolution period to cover the shipping time for the reship then you can keep the resolution open. Second question, answer is no there is not cost to use the resolution center. Third question, once the order is in the resolution center it can be extended as many times as you like whether that be you proposing an extension and the vendor accepting or vice-versa. If you are unable to reach a resolution with the vendor and the resolution period runs out then an admin will adjudicate on the matter. Admin decisions are final so you need to ensure you keep up to date with the process and respond to any proposals made by the vendor. Your most recent proposal should always reflect the outcome you are seeking. Hope that covers all your questions.