That's All review for Shopify Subscriptions

There is no way to reach out to customer care. If storefront has "Toggle" Style selected - when switching the Shopify Subscriptions widget from subscription to one-time purchase, the hidden selling_plan input retains the subscription plan ID. The one-time selection is therefore NOT added to the cart as a subscription. Tested it, thankfully did not make it live, this would really make the customers mad.