How do I speak with a supervisor in the Xbox Support? My case has been in escalation for...

I originally contacted Xbox Support on 4/24 about my repair controller that I am waiting on. The agent that day told me it had been delievered, upon checking for my device it had not been delievered here. The agent told me he would esclate my case and I would be given an update within 24hours. I waited until the afternoon of 4/26 to call and ask for an update. At this time the agent told me my case was not esclated and he would assist me with the process. After he esclated the case for me, I was told it would take up to 8 days for this case to be reviewed. I waitied more than 8 days before calling again on 5/6. On 5/6 the agent was unable to provide me any infromation, so I asked to speak with a supervisor. I was told they would call me by end of day, which never occured. So I decided to call again today 5/7 and had 2 agents hang up on me after giving them my case number. They told me to hold on while they review it, then never come back and line went dead. The 3rd agents did review my case but still had no updates at this time. So I again asked to speak to the supervisor where she told me that would not be possible. At, this point I have already paid for my series 2 controller and Microsoft complete protection and have not had the repair service fulfilled and would like a solution on how I can recieve my controller I sent for repair and have not been return yet. I sent the device on 4/11 and still have not recieved it back form the repair center!

Edit on 5/16

Providing an update. After waiting another 10 days for them to resolve my escalated case, zero progress had been made. The agent I spoke with today 5/16 said they need me to file a police report for the missing package. She also said that at this time there was no update. I went ahead and filled the police report as the agent asked, upon calling back to update them with the information. I was unsucessful in speaking with a agent willing to assist me. After providing my case number they would ask me to hold while they review it, during this hold period they have decided to disconnect the call. I am just wanting to provide the police report number so my case escaltion may get a resolution. At this time I am still waiting to speak with an agent to update this case and I have reply to the email esclation case with the police report information and UPS claim. I am concerned that this case is being lost or forgetten about. Its been over a month since I sent my controller for repair and am still waiting to receive it. How do I speak with a supervisor in the Xbox Support to make sure my case is still being reviewed?

Edit on 5/20

I have done everything asked by agents and provided all the information required, after talking with a tier 1 support agent still no update 5/17after providing all the information asked and being told I would have a resolution in 48 hours. So i waited and recieved nothing so i called this morning 5/20 to be told that there is still no update. They are still working this case with no update or realistic timeframe. I never new sending my controller for repair would be this exhausting and I will never buy microsoft complete. It saddens me that they do not require a customer signiture when shipping a customer device. That would be a simple way to protect my device and save both of us this headache. I just want my device back and still been waiting over a month.

:)