Bad experience that is costing me

I called their office to cancel debit order payment and advise I will be paying cash due to job loss, they agreed and also send me a confirmation letter that the debit order was canceled. And I immediately paid by Eft hence the debit order bounced due to insufficient funds. Now for the new month of June, a debit order went through from Assupol, the same debit order I canceled, it bounced and and bank charges.I tried to call them but I was onhold forever.. This is a very bad customer service,