Hello, has anyone experienced that there was some material left in their…

Hello, has anyone experienced that there was some material left in their tooth besides pulling it out? Besides that, I was told something else, but I forgot what it's called, she cleaned the canals, says she doesn't feel it, it's been two years already. Such a nasty one then paid 30 thousand for this tooth in a normal dental clinic, and he didn't even notice that his tool broke, so sad ?