Cannot Receive Calls from ATT Users!

[spiegelconevadallc]

I have not been able to receive call from any ATT user.  I have been to the store 2X and been on the phone 4X for a total of 4+ hours.  They escalate the claim and then close the ticket without ever confirming that the problem has been solved, WHICH IT HASN'T.  I'm at a total loss as to what to do and wanted to reach out to the community for help.  My phone is my business and it's creating a massive challenge for me.  Verizon has done a poor job assisting me and ultimately solving the issue.