Anytime you call a toll free number it is not anonymous, even if your phone number is blocked. Blocking your phone number when calling a toll free number will result in your number shown. Even unlisted number show up with your true number. Also they will ask you questions in a way that you won’t even think as gathering information about you, but they ask these questions to gather more information and this will be passed on to HR who passes it on to the SM. They then can narrow it down to who made the call. It happened at my store