Kalos Tv Subscription Cancellation Getting Failed

I am writing regarding my Kalos TV application subscription linked to the email address rendertesting**@gmail.com. On 24 June, I attempted to cancel my subscription and disable the autopay option, but the cancellation failed and the subscription remains active. At this stage I have not yet been charged for any new period, however I am concerned that the autopay will continue and that I will be billed against my will, even though I have already tried to cancel. I have not been able to resolve this through the app and I have not yet contacted customer service directly. I request that my Kalos TV subscription be fully cancelled, that autopay be stopped immediately, and that no charges be made to my account from now on. I also ask for written confirmation that my subscription has been terminated and that I will not be billed further.