MTN WITH NO CUSTOMER SERVICE

My experience with MTN:

I sent a mail on 25/03/2022 to cancel my contract.

I received a mail back on 25/03/2022 saying they will escalate my query to the Retetions department.

On 12/04/2022 I received the following mail: Kindly note that contract 083###### will be cancelled on the 25-04-2022 as notice received. Please note that the last invoice will be finalized on the 12-04-2022 and the last debit order will be on the 30-04-2022

And then I received another mail on 12/04/2022: Kindly note for cancellation to be processed a 30 days notice is required

Please confirm the below security points in order to assist set the notice for 25-04-2022

Which I answered and mailed back to them.

Today: 18/05/2022 I received a new Invoice with my contract amount stating that another debit order is due end of May. How is this possible if I received a mail stating clearly my last debit order will be at the end of April????

I have all my emails as well as ref number but it seems like MTN is of no use.

Really fed up.