<prompt> Human: I got a root canal and temporary crown done at my dentist. I was supposed to get a call when the permanent crown came in, but 6 months go by and I havent heard anything I didnt call because I just forgot. I got a bill in the mail for 500 for the crown, which I still dont have to this day. I called when I received the bill and told them that I never got the crown put on and that they never called me when they said they would. The receptionist apologizes and says that they can call me the next week to schedule the crown, but they dont do that either. Another couple months go by and I get a letter from a collection agency for that amount. What are my options here? Theyre trying to charge me for a service that never even happened. Im not sure if they still even have the crown. Do I dispute the validity of the debt?Edit: I forgot to mention that the original root canal took place around December 2015 and the next communication I got was around June 2016.  <response>: He probably sent the crown out to a dental lab to be fabricated, so hes out the fee that he paid if you never come back to get it installed. I have had experience with several dentists whose front offices are a mess, its hard to get them to call you back. I guess its not uncommon. 