OWING SOMETHING I NEVER USED

I have been getting calls from MDB on behalf of Virgin Active stating that i owe just over R6000.00 for a membership since 2006 and i have been trying to inform them that i never took a membership ,i spoke to consultant who took my details as i was interested to joint and the next day i told him i cant join the gym for some reason but to my surprise i owe them , it would be understandable if i had been to one of the gyms but i have never during that time of the contract and i never even had qa membership card to access the gym... Money does not grow on trees so i cant pay for something that i never had its only fair <br>