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@andy20678 wrote:

but if don't get my money back i could claim for fraud 

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You could take the matter up with the Financial Ombudsman Service if eBay's final decision is not to reimburse you.

However, you are responsible for your account security. The only way someone could have accessed your eBay account is if you disclosed your password (even unwittingly) to someone else and you did not have 2 factor verification enabled. I believe 2FA has been enabled by default for quite a while so you would have had to have consciously disabled it at some point.

Unless you know who accessed your account your password was most likely "phished" when you clicked a link in a dodgy email. eBay's (never read) User Agreement does state that you will not "share your log in credentials with any third parties." eBay could argue that you were negligent in disclosing your log in credentials and disabling a security measure which directly caused you to suffer a loss.

Do you have anything in writing where eBay have stated they are going to reimburse you?