If you are getting notifications from NetDivision, then your Mac is infected with adware. NetDivision is adware for Mac.
NetDivision changes setting in your Mac. First, NetDivision installs a browser extension in your browser. Then, after NetDivision hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.