If all else fails, contact a good, reputable carpet cleaning company in your area. I'm on a first-name basis with my carpet cleaner, and he swears he can get anything out of carpet except rust. I had a candle spill in my nylon (awful) carpet and he was able to get it out.
My concern is if your candle was a dark color, like red or blue. Sometimes the dyes will leach into other fabrics, especially if you've heated it with an iron.