Continuous harassment for debt that is not mine

I'm constantly being harassed by this company regarding debt that is not mine. I have repeatedly told them they have the wrong number and that they must remove my number. But the SMS's and phone calls continue daily. I want to know if they have passed on my details to someone else because other debt collectors have started calling me too (asking for a completely different person). If this is not resolved soon I will be taking the matter further so contact me to resolve this ASAP.