I'm going to try be as concise as possible without outing myself.
So I pay for a monthly membership. T&C state must give one calendar month's notice before cancellation (like most monthly contracts).
Payment has historically been taken on 10th of the month but I took 1 weeks break (agreed by manager and in line with T&C) in Dec so payment date has been moved to 17th of the month. Next payment due 17th Jan but I wanted to cancel so informed on 12th Dec to please cancel contract.
They are insisting that one more payment needs to be taken before I can cancel. I am saying it doesn't because I have given one month's notice as per T&C.
I am happy to be told IABU and should have to pay for one more month but I just want to know how everyone else would interpret this.