Charges on account from years ago

Good Day, <br> <br> I have signed up for a contract at Virgin Active about a month ago. Then i was told there was an account on my ID Number which i have never registered (ID Number was used by different person) Virgin Active Menlyn said they will resolve the issue with Head Office.<br> <br> Today I was informed by head office that I owe Virgin Active monies in the excess of R5000 for a contract which i have not signed up with, nor informed about. <br> <br> Now my current membership will be cancelled due to this. <br> <br> Please resolve the issue so that i can continue my use of the gym. <br> <br> Kind Regards