Unfair and Unreasonable expectations when cancelling Membership

I have tried to sell or give my timeshare points away as I can no longer afford the annual costs of points or holidays. When I approached Flexi club I was informed that I first have to pay for 2018 and then I can request a cancellation of my membership and if the Trustees agree then it will happen. This has the potential to continue for years while they continue to take the money by debit order, even though they still have R3700 from last year to pay for any costs they may have now, to cancel the membership. Yes they will respond but only to emphasis that they are right.