VITALITY REFUSE TO CANCEL AND KEEP BILLING ME!

Earlier this year I made changes to my Discovery Health Policy & I cancelled the Vitality as I no longer make use of it. However, Vitality still continued to deduct the monthly fees off my account. During March I must have called them at least 6 times trying to resolve this, spending hours of my time and a fortune on airtime. Each time they assured me the issue had been resolved. Even a consultant at Virgin Active kindly tried to assist me with this issue. I am currently staying in Taiwan, and they are STILL billing me!!! I have contacted both my Discovery Investment and Discovery Health brokers to help sort out the problem, but even through all their efforts and several email confirmations that it has been cancelled, Vitality is STILL billing me. WHAT DOES ONE NEED TO DO TO GET THEM TO JUST CANCEL THE POLICY???? And never mind all the funds they deducted during this process...? ANY SUGGESTIONS?