For the sake of learning something new; could you "close" that current HELOC, transfer the balance to a new HELOC, and have the customer wait the 3 days? Or is it a case of once it's done, it's done?
It's one and done. They have 3 years to rescind the original transaction or until they sell or transfer their interest in the property.
Also, how does it work if the customer rescinds and is responsible for the balance, but then goes into foreclosure?
Fortunately I've never had to deal with this but it is my understanding if they rescind the loan basically becomes an unsecured loan and your foreclosure basically becomes a law suit to collect an unsecured debt. Someone else may be able to give you a better explanation.
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The opinions expressed are mine and they are not to be taken as legal advice.