What do you mean won't respond? Like if in gear it won't cut the power to the drive or you just can't engage/disengage a gear when clutching in? (I know you can shift without clutching, but does it feel stiff or does it jam is what I mean).
Maybe the bike is stalling out and acting out because of a bad clutch/gear assembly altogether. You may need to get your clutch replaced, which isn't as big a job as it sounds. How many miles on it?
100% don't wait on this and take it in...I wouldn't ride on this bike, it could kill you!