First of all, I am sorry to hear that you have not heard anything back about your RMA. It can take up to 3 days to respond to an email but we should have definitely replied to you by now.
I will look in to this personally for you and see exactly what happened. Please send me a direct message with your email address and full billing address. We will use this information to access your details and find out exactly what happened.
Once again, I am sorry for the delay and I will make sure this is resolved for you. If you do have any other questions at all, please don't hesitate to ask and I would be happy to help.