Cancel but you still pay

I have canceled all Telkom services (land line and fiber) March 4. I received confirmations via email and sms. I ensured to follow up via chat, it was confirmed.

I received a call today, March 25 and am told that I will have to pay until November even if the services are cancelled.

How is this legal?

Here are the disputes:

********** 9 CancelService TELKOM CANCELLED 2019-03-04 MORE DETAILS ********** 0 CancelService TELKOM CANCELLED 2019-03-04 MORE DETAILS ********** 9 CancelService TELKOM CANCELLED 2019-03-04 MORE DETAILS