Cancellation of Gym membership

Both my wife and I had frozen our accounts until October. However, Virgin Active decided to debit me for one of the accounts. I have been now trying to cancel both our memberships since we have both left SA and won't be using VA anymore. This has been a very difficult task to accomplish. I have sent numerous emails with no luck of response. I even tried calling using their international number and it goes straight to voicemail. I am really disappointed with how my account is being handled and I need to get a response. Also why have social media pages if no one is keep tabs of them. I left a message on twitter hoping someone will attend to it and to my dismay I haven't recieved any response from them.