Calls multiple times per day, never leaves messages. Today I finally answered to see what it was, and there was no one there and it hung up immediately.
Matthew Shea's profile and activity

Most Reported Callers
Recent Activity
Caller: Unknown
Seems to call from a variety of numbers. This is the third time I've blocked and reported them.
Caller: Mercantile Adjustment Bureau
Calls repeatedly, sometimes multiple times per day. Never leaves message.
Caller: General Revenue Corporation
Calls frequently, never leaves messages.
I'm not one of their customers, but...this was a telemarketing call from National Grid utility company to announce some expo or something they were having for people in need of financial assistance.
Caller: National Grid
Followup call after I called VZW customer service. Automated survey computer. Really distorted audio. Very f-wording annoying.
Caller: Verizon Wireless Survey
Canadian Pharmacy. Never stop calling. They call from a different number every time.
Caller: Canadian Pharmacy
The latest number for the great "Canadian Pharmacy". They call every day.
Caller: Canadian Pharmacy