These are numbers that Chase Credit Card uses to contact you….they usually (always) show up as “unavailable” on the caller i.d.
402-220-3991
402-220-4351
302-282-8004
770-423-7998
The best thing to do, and this is what I have done after reading about it at another site, is that if you have a cell phone and they are calling that, save the number to your contacts, and set the ring tone to silent for that number. Keeps out the annoying ringing from these monsters.