Fitness First did this to me, probably a genuine error their side that they didn't cancel my account properly but I'd cancelled the DD with my bank and it re-ap

Fitness First did this to me, probably a genuine error their side that they didn't cancel my account properly but I'd cancelled the DD with my bank and it re-appeared. I contacted the bank about it and they offered to put a lock on my account so I have to be contacted about any future Direct Debits which seems like it should be the default.