Indeed, strange number and practices. Made some offers that were interesting, but then wanted my credit card to confirm. Emailed me an offer, which did not look like regular emails i receive from the NY philarmonic orchestra (different email extension). Usually I receive offers by email for which I can pay on the site.
You can have these calls stopped by calling the NY Philharmonic Customer Relations at (212)875-5656. I selected option 2 and spoke to a customer service representative. I asked the representative to put me on their "Do not call list". I remained polite during the phone call. The representative responded in kind. I was told that the do not call request will take effect immediately.