The best course of action is to ask Apple to remove the new listing. Then ask them to update the old one with the new feed address. You can email them at podcast@apple.com
You no longer can get our stats on the new feed, and the squarespace feed is less than perfect for podcasting. What made you switch to their platform when you had full control of your website and podcast ready feed to begin with?
Also who is hosting your media now?
Todd