How do I return faulty item when seller is ignoring my messages?

I recently bought a heated vest for my elderly mother, for Mothers Day.

When she tried to use it, it wasn't working. I visited her the following week thinking she didn't know how to use the item, but I could not get it to heat up. I contacted the seller, let them know it was faulty, but havent heard back, after numerous messages.   Ebay sent me a standard email saying they will step in if the matter is not resolved. That was weeks ago.  What are my options?

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You need to open a dispute with eBay's MBG (see below). hopefully you haven't passed the 30 day threshold.

 

https://pages.ebay.com.au/ebay-money-back-guarantee/

 

Edit. Is that an American Akita on your profile photo ?