Why Should I Pay For Another's Wrong!!!!!

Getting signed up at Virgin active Mt Edgecombe has been a real nightmare...my wife and I went through on the 29th November 2015 to get myself a contract...had no hassles with our sales person Joash...everything was fine on the day of activation... but to my surprise Joash called me up on Monday morning stating that my application has been blocked due to my account being in arrears...this was not the case I hade a gym contract six years ago with virgin but payment was not coming off my account but someone else's...the other person failed to pay the premiums...in the past six years I haven't been contacted...and now it becomes my problem because they cannot find the individual concerned...this shouldn't be my problem....club manager Devon Daniels failed to assist me with my request....I did meet with him and instead of them giving me feedback I had to make numerous calls to them only to here them say that I should pay for someone else's debt if I want to start gym there...I don't have a problem settling if virgin active investigates or shows me some proof that they tried to contact me in that six years......