Cannot Get Debit order right, would they be able to recover your vehicle?

Gave notification to car track giving them new banking details. I have confirmation that they have changed the details. Come end of month I get a message saying that the order did not go through and I am in breach. I sent car track proof of debit order and asked for confirmation of cover. I was met with dead silence. I then asked to cancel as if they cannot get a debit order right, they certainly won't be able to recover my car of need be. Again dead silence.