Being billed for cancelled service

Good day Telkom! On the 21/09/2017 I sent in a request to have all my telkom services cancelled as I finally have fibre elsewhere - I do have record of when cancellation was sent. Telkom said it takes 30 days to cancel. So from the 21/09/2017 till 21/10/2017 was the cancellation period. How dare you now bill me for services from 04/11/2017 till 04/12/2017. My service with you is cancelled. Telkom account number: ********** 23999, service ref: ********** 124. Cancel everything please.