Mbd pestering me for a cell c account i dont have!

Mbd inc keeps on pestering me over a cell c account I DO NOThave!!! They asked me to go to the police get a statement saying I dont have and never had one. I emailed them did exactly what they asked and they keep smsing and emailing me for **** that i don't own... Cell c please get these ****ing people off of my back this is your **** not mine!!! I don't even have a damn cell c contract!!!!