Videos are utterly irrelevant and Ebay cannot help you as you did not follow the correct procedures as outlined in the buyers guides.

You have 30 days from receipt to check out an item and open a dispute, if relevant. The fact that you were not aware of this does not matter - it is incumbent on you to know what is going on when you purchase on the platform. The information is there at your fingertips.

Since the item was defective, you could have opened an "item not as described" case.

Seller would then have no choice but to either send a shipping label or postage funds if they wanted the item back, or they would have had to refund you.

Going forward, if you paid via PP, open a dispute right now and do not close it until you have a refund.

Do not let the seller try and persuade you otherwise - in fact you have no obligation to communicate with them at all.

At some point in the next few months Paypal will no longer be an option for buyers, so please be aware of what to do in the case when things go wrong.