The potential problem with speaking to the disappointed sales weasels at all is that they can then potentially assert (...yes, even falsely) that in the course of that conversation (which you initiated if you made the call) you expressed interest in not proceeding with the previously submitted contract rescission.
Yes, this potential scenario is admittedly a bit far fetched, but let's not overlook or forget the fact that these weasels lie, all day and every day, for a living.
If the rescission correspondence has been properly addressed, timely submitted and signed by all who signed the contract, there is absolutely no need for any further conversation, not even to "play" with the weasels. The law is clear, effective and it will work well for you --- as long as you don't now suddenly choose to get in the way and unnecessarily muddy the waters. Stay off the phone and do not talk to them at all.
Just my own thoughts and personal opinion. YMMV.