I was in your shoes this time last year. 3 waitlists (one at my top choice) and no acceptances. I sent them something in writing at least once a month - either a letter updating them on my current activities, or a letter showing my continued interest, or I had new people send letters of recommendation. Calling is risky. I managed to piss off 2 schools just by calling twice in one month. However, the guy that always answered the phone at my top choice school was pretty easy going so I dared to call there once every three days. Time went on and no acceptances. Waitlists weren't moving. Then finally it came down to the Friday before classes started. I called and was told not only that there was no chance of getting in that year, but also that I should not apply the following year because if I wasn't good enough to get in this year, I wouldn't be good enough next year. Monday morning classes started, and I received the call. Needless to say I just finished my first year at my top choice med school. So don't give up hope! Good luck!