T-Mobile Other persons sim card was placed in my phone, causing many problems. Internet

In November 2011 I was at Target talking with the district manager regarding my cell phone. I have been with T-Mobile for more than 8 years. However... there have been ongoing problems. I am a translator/tour guide on the road quite a bit and my phone is very important. Problems with phone; I have been back to Target 4 times, several times in different stores during my over the road jobs. Upon landing in my home town in CA I had absolutely no reception. The phone was fully charged before I went on the flight. We have a family plan and every time we tried to call the calls were dropped, ongoing problem for 8 years. Before I started on my next job I went back to their store again and a young girl put a "new" sim card in, saying that should solve the problems. However, I find about at the end of my tour, that she had put an old sim card in, belonged to some one else. A T-Mobile tech told me this and what a blunder that was. Result, no call log, I could sometimes call out, but not receive calls. No voice mail. I lost an offer from my boss for another tour. I contacted BBB and T-Mobile lied to them, stating that I never requested another phone. Really! That during the sim card incident I had used 191 minutes. I told them I could sometimes call out...... I have 1000 minutes/month. Needless to say I need those minutes wile I am on the road. They want to charge me $200 to drop the contract. Not. They owe me $5000 for losing a job. I wish some one would help me. How can a company operate this way, ripping off people, everyone knows about it and nothing is done. They keep ignoring the fact that I lost a lot of money and make up stories to BBB that will make the outcome work in their favor. When will the government step in and do something. This is like a communistic tactic, forcing people to keep a lousy service otherwise brutally, unjustified be punished.