Vodacom difficult to contact

I dont have an account with vodacom, had one 100 years ago.. but on my credit profile it shows that i still have an account with them and that I still owe them money. It is almost impossible to contact them if you do not have a Vodacom number. They confirmed that I dont owe them anything after i battle for +/- a week to get hold of them. My question is, why cant they delete my profile/account form there system, its been 100 years i dealt with them and they confirmed that i dont owe them a cent. I dont have any bussiness with them, why still keep my profile on their systems. This now has a negative reflection on my credit profile....Can someone help Vodacom to rectify this mess and delete my name from their systems so that it does not reflect when I do a credit check.