can’t delete plugin w/o id # showing up on website

I’ve tried numerous times in multiple ways to delete this plugin but the previous action box I had in footer keeps showing id#. For instance, once I deactivate or delete plugin, this shows up in my website footer—> [magicactionbox id=”311″].

When I activate the plugin it goes away. Btw, I only had 2 action boxes, have trashed and permanently deleted them and this still happens. I have also deleted the plugin and re-installed because with it installed I don’t get the id# showing. However I really want to delete the plugin altogether. Please help!