With all domain registrars that I know, at least those that care about their customers, you have a three day full price refund policy, you just need to click on the one icon in your account and you will get the money for the domain. I am surprised that you are having the problem getting help from the M3Server as they have always been providing me a good service and you have to keep in mind that they are slower on the weekends. You just need to open a ticket on their site and then wait and they surely will come back to you.
