Sent 2 cancellations and still active

The first cancellation email was sent on 6 January 2016 and received a reference number of 001C3aB8MFENXAVK, the number that I requested to be cancelled expired end of March 2016, I sent the copy of my ID, banking details and account details, I sent another cancellation request using the same email as previously received back the reference number from Vodacom asking for an update and confirmation of the email received, I received a read report and yet another reference number 009Y~Y642. Checked and that account is still active, I will not pay for that contract end of this month as I gave proper notice period and did what was requested, cancel the number *** immediately and DO NOT CHARGE ME as I am not using this number at all! How must I follow your ways to get a number/contract cancelled but you can't follow your own ways.