"Waiting Time For Treatment"

When I visited the dental hospital which was about 3 years ago I was told that I was going to be seen again in 15 months. More than 15 months went past and I did not receive a letter for another appointment so I contacted the dental hospital to find out what is going on. After I successfully sent an email to them I received an appointment. I felt that some of the appointments that I had was a waste of time and they were unnecessary. My main concern is that I was put on the waiting list for treatment and I wanted to know if I am still on the waiting and how long I will have to wait because I do not want a repeat of what happened last time. I was told that I would be contacted to see if I still wanted treatment and I have not been contacted yet.