So the club are threatening to take you to court.
Let me guess...
You didn't actually cancel your season tickets, but instead just cancelled your direct debit with the bank.
If this is the case, you haven't cancelled , you still have an agreement, and still owe the money !
And that is the crux of the matter. Some people think by paying via direct debit you can just stop and you owe the club nothing. The reality is that you have committed to buying a whole season ticket but the club have agreed for you to spread the payments - you are not paying for each months matches, you've agreed to pay for the whole seasons matches.