Failing to cancel my contract

Shocking customer service from Mtn I cancelled a contract but I am still being billed by Mtn...below is confirmation from Mtn that the contract was cancelled

Good day

As per records it show that the cancellation was set for the 16-03-2023.

Warm regards, Ayesha Jaffer C: *** | www.mtn.co.za

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From: Adrian Petrus <***> Sent: Tuesday, March 7, 2023 9:08 AM To: Ayesha Jaffer [ MTN South Africa ] <***> Subject: FW: NOTICE OF CANCELLATION - ***

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Good day Could you please confirm that this contract was cancelled Regards Adrian

From: Adrian Petrus Sent: Tuesday, 07 February 2023 12:54 To: *** Subject: NOTICE OF CANCELLATION - ***

Good day Ayesha Could you please cancel the contract for the attached nr *** as I am no longer using this number Regards