DVC does not currently trade with Interval International, DVC is trading through RCI. The trading contract with Interval International ended a few years ago.
As noted, DVC no longer trades with II. What you might be able to work out would be a direct exchange if you have something truly desirable. Depending on what you have, you might need to offer a financial supplement to get someone interested. Of course this wouldn't work with anything you've already deposited. Given II's rules you wouldn't be able to trade an II exchange for DVC.