While I'm not sure that your question is directly answered here, here are two great resources for eSignature questions:
Did you update the email address on the actual client file after voiding the initial request? And save the client file? And once you did, if you go to your eSignature dashboard do you see the new or old email address there?
If you've done all this and it still reflects as the old email, i recommend doing a SAVE AS of your client file that has the new email, and sending the eSignature request from the newly created (save as) file.