Telkom misdirection

I am trying to cancel my Telkom router subscription and basically Telkom have set up their online portal and services in such a way that you basically cannot cancel any account or subscription. My router contract expired in December 2017 and since then I have been on a month to month basis. I have emigrated out of South Africa and I am not willing to come down to SA just to fill out some paper work to have this cancelled. This contract needs to be cancelled immediately as I have not been using it since April and I am still being billed.