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