There is no use marking your own reply as the solution

If you want to sell on ebay, you have to be signed up for Managed Payments and be verified before you list anything

You don't have their payment because you failed to meet your obligations as a seller

Managed Payments has been in place for almost two years, and was announced/being phased in two years prior to that

As in the box you ticked you had 'read and understood' when you listed

How to you plan to pay the eBay fees you owe for this sale?