deleted voice mails

All of my saved messages have been deleted from the voicemail of my home phone. I have spent hours talking with customer service reps, done the live chat, and been to an in-person store and no one has been able to help. I would like to send a formal complaint to corporate but cannot find an email or physical address. Can someone provide one? Or is there a way to send a direct message through this forum? In all the other posts I have seen, it says to click on the "direct message" icon on the upper right hand side of the screen but I do not have that option.