After the $7-8K you've spent on these bikes, not to mention the value you place on the life you put at risk every time you ride, I'm surprised you're balking at spending a fraction more to have competent people do whatever adjusting/realigning/reassembling must be done. Oh well. You've been burned by these baboons posing as bike-builders. Chalk it up to experience, keep your bikes away from that shop (or any shop in which you have less than full confidence), ask your fellow locals for help picking out a mechanic or LBS, and go to your regional forum here and ask for help. Good luck.