Does anyone possibly know / have suggestions where I can send my seiko Jumbo 6138 3002 for service/repair in Australia?

I took it to a local watchmaker about 1 year ago as it kept stopping and the date did not advance. After 1 year he supposedly could not get the parts and decided to take my watch back and now it does not work at all even after shaking.

I tried to reach out to VTA in Australia but never heard back.
I was tempted to open it up myself but I’ll highly likely make it worse…

Vintage seiko watchmaker Australia