EMPHATY STATEMENTS:

We would love the opportunity to earn back your trust! I hope that your previous experience won't affect your perception with T-Mobile as a whole. I'll do whatever it takes to make sure that your overall experience with T-Mobile would turn to satisfaction.

no one likes getting surprises, unless it's a special occasion
1. I can understand that this can be very concerning. 
2. Our goal is to provide the best service. 
3. Please let me make this right for you. 
4. Let's work together to ensure everything is resolved. Please give me few moments to check what we can do.
5. I understand that your concern involves a lot of other related issues, but don't worry! We won’t stop until we get this taken cared of for you.
6. I can't tell you exactly why they did that + [strong assurance of help]
7. I can assure you that we will get this done today.
8. Let's check on a few things and work towards resolving this issue today. Please give me a moment.
9. Let me extend my helping hand to you today!
10. I know that my deepest apology won't take away the frustration for reaching us multiple times but of course I'll make sure that I'll make your time worth it.