Receiving invoices and getting charged after cancellation of a conract

Hi. I keep on getting invoices and get my bank account charged even after cancellation of my contract. It is 3rd month i am writing to get invoice cancelled and to get money back. Could you, please, take care that:

1. I get money back for the March invoice (18.02.2019 – 17.03.2019)
2. I do not get April or any other next invoices and do not get charged for them.

Thanks,
Gunay