Harassment for debt which is not mine

I am being harassed by MBD for arrear accounts which I do not have. I have bought a SIM card a few years back, and after it was RICA's I was issued with a phone number. As it became evident, having belonged to a bad debt customer previously. I have received three SMS's, and multiple calls from private numbers today only for someone elses bad debt. Many previous SMS and phone calls now have me seriously annoyed. This is stupid. Get your facts straight and go see in whose name the SIM and number is RICA'd. Stop your harassment - it portrays poorly on your company. Don't tell me that you will "investigate and provide feedback" - just get MY number off your lists. I am not the one you are looking for.