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