I keep getting calls from this # 347-549-8933 and many others with different area codes. They never leave a message and when I call the numbers back they are all disconnected numbers. Does anyone know who's responsible?

That same number 347-549-8933 has called me multiple times over the last three months plus all these numbers and never leaves a message.  They are all disconnected numbers:
724-634-2837
631-938-6916
781-951-2032
430-222-4369
312-300-7251