foundation failure/poor workmanship

TN I purchased a new home 5 years ago and have had major issues with foundation cracking. I had to have $8500 worth of work done last year and the issues with severe cracking doors not locking and closing came back within 2 months. I have been told that my house was built where an existing home stood that had a huge basement and that no matter how much work I have put in this will not correct issue that I just need to tear the home down. What are my rights as a homeowner in TN. My home passed all inspections including FHA.