Caller ID

We received help from the OFFICE 365 Help Desk to assign our outbound caller ID for all users to be the Service number assigned to the Auto Attendant. It was not an easy process, and I had to get step-by-step help while using the PowerShell commands. At the end of the very long call, we tested the outbound caller ID, and it had worked. Unfortunately, two days later our outbound calling service stopped working for all user accounts and while using all devices (PC App, IOS App, and VoIP SfB phone). We have opened multiple tickets since June 1, 2017 (Office 365 Ticket #30126-5884593, Office 365 Ticket #30126-5866774, and Office 365 Ticket #30126-5265402) and the Tier 1 agents have troubleshot everything they could think of at their level. Initially, we were told the issue was a system-wide outage, but we have received conflicting emails from the Office 365 Support team indicating that in fact the issue was fixed on June 3, 2017. As of today Tuesday, June 13, 2017, the issue has not been fixed, and we have experienced a continuous outage on all outbound calling capability. We suspect the issue was brought on by the PowerShell Caller ID changes, but even attempting to remove the Service number from the Caller ID has not fixed the issue. At this point, our small staffing & recruiting company has suffered the consequences of relying on a single service that in fact has not provided us with the 99.9% uptime SLA and we have received NO HELP from the Microsoft Tier 2 or higher Engineers. At best we have received email responses at 1:02 AM because I guess it makes too much sense to conduct business during your client's hours of operation. We are extremely disappointed with the Skype for Business PSTN service.