Debited my account after ending membership still

I'm going to really try and be polite here as I don't know else to do.

During January this year I contacted PF to cancel my membership. It was a 2 year contract that I signed but continued further for about 18 months, so I knew we were in a month to month relationship at that stage.

In January I contacted them to cancel the membership. I was informed this will only take affect end of February. It was a back and forth fight to get confirmation of the cancellation of the membership. Which I received on the 28th of February.

At this stage life was fine as end of Feb was my last debit order... ................................Then this morning I nicely see a debit order from PF?

Can you kindly explain why you are taking my money now again?