Hi,

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Thank you

eBay credit can't be used to pay anything except fees, but you should be able to get it refunded (if but eventually). 

Requesting a refund of your eBay fees credit balance

If you have a credit balance, you can either leave this credit in your account and use it towards future fees, or you can request a refund and we'll send you the money. You can only request a refund if you are not an activated eBay managed payments seller.

Here's how to request a refund of your credit balance:

1. Verify that you have a credit balance on your account. To see your account balance, go to your Seller account page. A credit balance appears as a negative number on your account status and monthly invoices.
2. Make sure that your contact information, including your address, is up to date.
3. Contact us to request a refund on your credit balance.

We'll issue your refund to the payment method where the payment originated. For example, if you made the payment with a credit card, your refund will go to that card. If the payment was made using more than one payment method, you can choose where to send your refund. Refunds are usually processed within 30 days.

https://www.ebay.com.au/help/selling/fees-credits-invoices/fee-credits?id=4128