Hi Wootie,
1. For a quick fix, you can log on to your account at acobot.com and turn the bot off from your home page. The chat box will hide.
2. To remove the bot code from your site
– If you install it through Acobot for WordPress plugin, what you need to do is disable and uninstall the plugin.
– If you manually copied/pasted the code on to your web pages, you need to locate these pages and delete the code.
Keep in mind you need to clear cache to get the above effective.
Does the above information help? Feel free to let us know.