Go into "Send & Request" --> "Manage Contacts". Click on the contact that you are referring to (you should get a summary pop up for that contact) and, at the very bottom, there is an option to "block this contact". Click on that and the seller should be effectively blocked from contacting you or requesting money from you through Paypal. You should also be able to select "block sender" for the email address through your email provider. In Gmail, I just have to click on the email I received, click on the 3 dots on the top right and select "block xxxxx". Not sure how it works for others, but a similar function should be available. Hope this helps!
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