Cancel Ss-DVESITY debit order.

Cancel Ss-DVESITY debit order. Please I need help. I want to cancel this debit order that they approved on my account. This Ss-DVESITY is a ****. They stopped me in the street, told me I won something, and I must just fill in the form, I filled in the form, and was suspicious, I cancelled everything and told them to stop anything as they did not explain it properly. I even tore up the paper. This morning the DO for R250 went off and I cannot stop it, I am opening a ***** case, but who is resposible for the Banking charges???? They told me lies in order for them to get my detail. I found this people accross the PostOffice in Welkom. I told them to cancel this thing of thiers, they promised me that it was cancelled but when I check my app is still there and active. I don't want it please can you help me to cancel it.Help please 🙏