If you are getting notifications from GoSearch6, then your Mac is infected with adware. GoSearch6 is adware for Mac.
GoSearch6 changes setting in your Mac. First, GoSearch6 installs a browser extension in your browser. Then, after GoSearch6 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.