I would just ignore them, just say "wow okay seriously? I said i don't. Now stop." and only say that once. If they keep at it, just completely ignore them and act like they don't even exist. It might seem childish but it might be the only way to get them to stop. They just enjoy "getting your goat" which means they do it because they get a reaction out of you. Therefore, don't give them the reaction they're craving, and they'll stop.
just ignore it.. they're going to tease you if they keep seeing a reaction out of you. like if you go, "OMG no i DONT!" they're going to keep saying it just to see you freak out so if you dont give them a reaction and just say, "no i dont" and leave it at that, they'll get bored of it and stop.
I had to deal with a similar problem, I got people to stop by calmly denying their accusations, and not becoming exasperated when the teasing is brought up again. So, the key point for me, was remaining calm and maintaing my composure, the teasing stopped fairly quickly afterwards