Debit order not being cancelled - ever

I would like someone to contact me regarding numerous emails trying to stop my debit order which has not been cancelled.

I gave the instruction on the 1st of April (one month notice) to cancel the membership for reasoning of immigrating. I knew I was required to give a 1 month notice.

It is now august and every month a debit order goes off the account. I have sent 3 follow up email since this with now response.

I need all debited funds for May, June, July and August refunded to me.

Please could someone in a senior position contact me in order to assist with this.