No Service - Residential Landline Cancellation

On 14 July 2017 i sent my line cancellation for to the ********** mailbox. I have not heard a word. There is no way to contact support via phone. Only mail allowed. It is now 14 November and i haven't heard a word. On 13 October i forwarded the mail to the ********** mailbox again and have still not received any feedback. It has now been 4 months of paying for a service i don't use. Can someone please help me ?