How to reach T-Mobile customer service directly in Charleston (no offshore/Philippines)

I had the amazing pleasure of getting through to the Charleston call center after FOUR MONTHS of trying to get my problem resolved by "my team of experts" at various offshore locations.  It was a random fluke that I got through to them, but my four month old problem (which already cost me at least 9 hours of talking and chatting with T-mo) was completely understood by the lady who helped me, and she forwarded me to Michael (A manager at that location), who got to the root of my problem and fixed it within minutes.  And he promised to personally monitor the situation for the next two billing cycles to make sure it worked.  I swear, if it wasn't for that call center, I would have a different carrier right now.  

I actually called back with a follow-up question but got routed offshore.  That person wouldn't forward my call to anyone in Charleston, even though I literally begged her to.  Because she was "sure" she could put a smile on my face today.   Gimme a freakin break.  I hung up and kept calling until I landed in Charleston by chance again.  Which is really my only suggestion for anyone who wants to reduce your frustration and the time it takes to resolve your situation.