Once you have decided that you are no longer interested in a school, please please please communicate that with the coaches. I know it is not an easy thing to do, and probably a little scary even, but it's not going to kill you. While the coaches may be disappointed in your telling them you are not interested, they are used to rejection. Trust me. It is part of the recruiting game and coaches get used to being told no quite a bit.
Be honest with coaches as to where they stand with you and do not string them along if you are no longer interested. They need to move on and pursue other kids to fill their roster. Ever week I hear the continued frustration from coaches saying that a kid just suddenly stopped talking to them, and they aren't sure if the recruit is no longer interested or what the situation is. Simply ignoring a coach's attempts to contact you is not alright. Think of it this way... how would you feel if the person you were dating simply stopped talking to you and you didn't know what had happened or what was going on? It's kind of like that. You're ending a relationship and as much as it might be tough to tell them it's over - it's the respectful thing to do.