Sweetmax Limited Cancelation

I have a serious issue with my Sweetmax subscription that I have been unable to resolve despite my efforts. I clearly requested that my subscription be cancelled, and afterwards I also sent them an email asking for cancellation. However, even though I asked to stop the service, Sweetmax has continued to take £28 out of my account every week since 28 August. These payments are being taken from my account with the Royal Bank of Scotland, and there is still no sign that the subscription has been cancelled. I find it unacceptable that my cancellation request has been ignored and that money is still being taken from my account on a weekly basis. I request that my subscription be cancelled immediately and that these ongoing withdrawals be stopped without any further delay.