Phone Mail Zip File

 Today I received a note with a 510.zip file attached. It is supposedly voice mail but I doubt it. So I loaded it and created a scan of the directory the zip was loaded in and nothing was found. It sure seems obvious the sender is not Verizon Wireless. 

 Does anyone have any experience with this?

Verizon Wireless (596178@t-mobiel.com) Add contact

To: me

Voicemail from +13608149717

 You just received new (voicemail) message.
Received: 6/12/2015