I did my class 1 renewal in Singapore (of all places, and yes there is a CASA DAME there) just before Christmas. Paper work was submitted by snail mail to Canberra, and had the medical certificate arrive in my mailbox one week after New Year. No dramas. Sorry to say, but I've never had a problem dealing with CASA with regards to medicals. If you use their online portal, you can keep track of your service requests with them.