A good amount of people have been running into the issue of not being able to download google play store apps or updates using the T-mobile services. I have their internet service and cell service and every time I attempt to install an update using google play it will just stick on pending and will not initiate the download. Tested the downloads on a different internet provider and it works just fine. Clearing the cache nor resetting the phone to factory can fix this issue.
I will link a few reference sites where others are talking about this exact issue:
If anyone can help or can forward this to the proper channels would be great.