Refusal of cancelation and threats of blacklisting

My parents purchased a vacation product from DVC. All payments are up to date. Due to changes in personal circumstances, they requested a cancelation. Linda Davidson telephonically confirmed to my mother that due to the reasons provided, a cancelation may be effected once done in writing. A formal request for cancelation was sent to Linda Davidson, who in turn rep**** that the contracts cannot be cancelled. She then continued to threaten that my father will be blacklisted with ITC. She confirmed that she will cancel the debit orders as per request - this was never requested. A cancelation of the contracts was requested. She then said that the contracts will continue to run until such time as DVC cancels due to non-payment and proceed to blacklist with ITC.<br> I fail to see how it can be legal for a contract not to be cancelled. Furthermore, I find it unacceptable that my father be threatened by Linda Davidson after a simple request for cancelation. To make matters worse, none of their points or benefits were ever utilised, and never was a refund even requested. The only request was to cancel the contracts and membership.<br> Disgusting service by DVC!