I am really frustrated and disappointed by t-mobie service. I claimed a device from my insurance as I suspected my 6s was having issue. However, after upgrading to latest iOS the issue was gone. So I decided to ship back the claimed one( without even replacing my old phone). Its been two months since I returned the device and suddenly after two months I am being charged restocking fee for the device ($649.73). The charges were posted before 10 days. Since then I have called tmobile customer service thrice. every time representative promises that research team will get back on this and promises a callback on the issue. I HAVE NEVER GOT A CALL BACK FROM ANY REPRESENTATIVE TILL DAT, but I have called multiple times to remind about the issue. I just called representative again and she said research team will get back in 2 days. I DO NOT understand why is it taking so long. On top of that I am in a group plan so other people are waiting on me to pay the bill. I want to get this resolved within 2 days as the payment is due in 4 days. I really don't understand what is the point of having insurance for the phone if I have to go thru all this hassle.