Non completed ADH repairs

Good Morning, I am currently experiencing terrible service from the Samsung Care Center Century City. I sent my phone in for repairs under ADH on the 2/10/2017 and was told that it would be ready on the 4/10. I called on the 4/10 and was then told it would be ready on the 5/10, I called on the 5/10 and was told that they cannot find my phone. I then was told to call back later, which I did, they then said that they do not have the parts to fix my phone. and that the parts would be ready on the 9/10, I then called on the 9/10 and was told that my phone will be ready on the 10/10. I then called back today and the lady couldn't find my phone on the system, then checked with her manager and said that there are no parts to fix my phone and they cannot give me an ETA on the parts. Im sure that you can understand my frustration. My ADH number is: ADH1461 Samsung s7 Edge I have emailed **********