I don't owe you anything

I have been receiving phone calls from your call center agents that doesn't have respect over the next person telling me about a cell c account that cell c doesn't even know about. I'm gonna say this for the last time. I got in contact with cell c asking about a contract that I don't even know. How come you guys collect on a debt that doesn't even appear on my credit profile. I will definitely to to the ombudsman for harassing me. Get your facts right I don't owe you. My name is koketso Tshabalala ***