Cron jobs

I am not, currently, using Mail Poet and have deactivated/removed the plugin from my WordPress website. However, I’ve noticed that my website is still receiving Cron attempts and I have not been able to find where to stop them. Are you able to stop them from your end?

e.g.

http://www.eiki.com/wp-cron.php?4453fac3d05911af0226e6b45f96426c=&action=wysija_cron&process=all&silent=1

Note: The Mail Poet premium support form does not recognize my credentials and has disabled the submit button.

INVOICE n 57846 February 24, 2015

Thank you