CANCELLATION REQUEST END JAN 2021 STILL RECEIVING INVOICES IN MAY 2021

I have sent a cancellation request on 30 January 2021 and a follow-up request on the 15 May 2021, however I am still being billed. I am aware of the 30 day notice period. I have all my documents via email as proof. The outstanding amount was settled on the same day that the cancellation request was sent through (January 2021)!!

Informing Telkom of the issue has yielded, NO RESPONSE.

Why am I being billed for a service that I have already cancelled?

Telkom can you PLEASE address this matter urgently or I will be forced to escalate which is not a route I would like to take.