What is this apple bill?
I’m being charged 4.99 a month and I don’t know what for.
only thing I can see for 4.99 is Apple TV which I don’t have or use.
can this be refunded?
If you have subscriptions, then that would be because you signed up for subscriptions (/because your account was used to sign up).
If you signed up for a free trial, then that would auto-renew after the trial and start billing you, as all subscriptions do, most commonly in monthly cycles.
If you do not wish to continue a subscription, then you should cancel it. How to cancel a subscription from Apple - Apple Support
If you think that you may qualify for a refund, then you can request that. Request a refund for apps or content that you bought from Apple - Apple Support. But also cancel.