Yes, I wound up here also after they kept calling every evening and not leaving a message. Super creepy. Didn't know if it was a stalker, a wrong number, or what. Yuck!
I get these calls every time they put up tickets for a new season or series on sale. I haven't gone to the symphony in a while but they seem to keep in touch more than blood relatives. Even when I did go it was for one or two concerts at best. The musems and opera do the same thing as well so I guess if you don't want them to call it's best to purchase tickets at the box office directly.