I spent 18 minutes 31 seconds waiting on a line to...

I spent 18 minutes 31 seconds waiting on a line to get a dentistry appointment. Wasted effort. Nobody picked up. No message says that the correspondent may be online, no indication of the estimated waiting time. No proposal to call me again. Contrary to what your site falsely informs. Could you review your telephone system, which is inappropriate for the size of your institution?