Tired of trying to get debit order cancelled

Is the most irritating call to make. You have to speak to the stupid answering machine I don't know how many times before you get to speak to a people and then when you do get through they transfer to other departments without even trying to help If you are lucky to get answered by a people they give you information as how to cancel your debit order. I followed their instructions but this month the debit order went through AGAIN I have been trying to cancel the debit order since November 2018!!! So if anyone at Sage is able and willing to help me ...it would be great And just btw the reason the debit order needs to be cancelled is because I paid the invoice in cash in October 2018