Ebay give you 30 days only to return faulty items.
This is between you and the seller. If it was a UK business seller, you can ask Citizens Advice to see what 'next steps' they suggest.
You could try the manufacturer, but, from what I have seen on the forums, it is likely that you have not bought genuine items.
Really, when you buy expensive, branded items and are expecting a long warranty, it is best to go straight to the manufacturer.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)