As you were already advised

How long you have been signed up to ebay is not relevant 

You needed to be signed up for and verified for Managed Payments

And as you say yourself, you have used it very little

You are a 'new seller' in the eyes of eBay and the hold on funds you agreed to when listing do apply to you

There is no point contacting eBay CS who do not have the power/authority/ability to release your funds early

And there is no reason why they would/should be even if they did have that power