Harrasment by css company for account I’ve never had.

This business is a joke, I keep on getting sms to contact them but no contact numbers for a cell c account I have never app**** for and now threatening to hand me over for an account I don’t know of. Thing is I am a very busy person and have no time in a day to be playing hide and seek with a company that clearly don’t know what they doing. I must spend my time and money to look up this company who have no decency to leave their numbers. You need to tell me where you got my numbers from because you can clearly see I am not a cell c customer