Note: you're not contacting eBay by posting on these boards. They are public forums on which any eBay member can post, and the responders are, like you, fellow eBay members who give voluntary helpful advice and information.
However, we can’t follow up with your seller. You have 30 days from the latest Estimated Delivery Date to open a dispute under the Money Back Guarantee, and thereby get a full refund. You must do this; no one here can do that for you.
https://www.ebay.com.au/help/policies/ebay-money-back-guarantee-policy/ebay-money-back-guarantee-pol...
Read the link, which contains all the conditions, timeframes, etc.
Come back here if you’re not sure about anything after you’ve read the MBG help page.
