Unsolicitated phone calls are more dangerous than ever. With Caller ID spoofing they can show up as a company or government agency. With all the hacks you should expect that ALL your personal information is known such as SSN, address, Drivers license and much more. In addition, your customer information with a company is also known. Because of this your only defense is to hang up and then call the customer service number to check with the company. Only use the phone # on the company website or your regular bill. Do not use any other.