Game is harrasing me.

Hi..I have been experiencing a very bad situation with Game. I am not a customer at this store, however I think they mistakenly recorded a certain customer's number with my number. For the past two years I have been getting calls that they are looking for a certain Mr Phungula. I have no idea who this person is. I called Game and they referred me to their accounts dept to rectify this as I was getting annoyed. However that has not changed. I now get messages informing me about debt legalities. This is annoying a disappointing. I don't understand why they can't solve their issues. I hate this.