As already stated, the seller is telling the truth.

As for you not being able to leave feedback, have you tried the usual tricks, like clearing cache and cookies or trying another browser?

As for getting in touch with customer service, you can contact eBay via live chat from the help page (if you scroll down to "contact us"), but it is better not on the weekend if it is not a really easy question they can answer from a script because I am not sure they can transfer you to a supervisor on the weekend.

I would try clearing cache and cookies or another browser first anyway.

Most likely the seller is a new or 'sometimes' seller

As such, like all sellers in the same position, their funds are held by eBay until they prove they are a trust worthy seller

I am not sure what all the ????? are about, it sounds like you do not believe the seller

A seller being able to show eBay they have been given positive feedback *can* in some cases get their funds released earlier than the usual 30 day hold

eBay Help is at the top of every page to contact eBay (in normal business hours, so not now)

I doubt it is something they can assist with (other than telling you they will look into it)

There are other threads on the forum about the feedback button being greyed out, maybe have a look at those and see if anything suggested in them applies to your particular problem