We've been getting the Eric Jones spam too. About one every 2 days since early August.
We have Google recaptcha installed for over a year but somehow they get around it.
It would be good if someone would develop a Prestashop module for bouncing or blacklisting spammers, in the same way for example, as AppleMail has rules and spam filters and a 'block this sender' feature. I have no technical knowledge but such a module shouldn't be too difficult to develop.