Their phones must be on silent, because calling does no good. No one answers the line. I must have called 50 times today and the phone rings and rings until it disconnects or is busy.

40 times afater 1pm and still nothing. Making the total number of attempted contact over 120.

May depend on when you call and/or how busy they are. This isn't the busiest location, but I do think they take an hour lunch break? At least that's what I remember from a past visit. They do answer, as I witnessed it before. Try again starting at 1 PM and see what happens. Worst case? You may need to visit in person and possibly inquire about why they didn't answer one of your many phone calls.