fixing payment failure for subscriptions

I have been using woocommerce subscriptions for a year or so now, and am having some problems understanding what the best way is to handle payment failures. They fall under 2 categories: New members whose payment fails when they try to buy a membership, and old members whose payment fails when the subscription attempts to auto-renew. I can see various actions under both the “order actions” (for both categories) and “subscription actions” (for the 2nd one), but am not sure what to use, and in what order. How do I handle new members whose payments failed? (I’m not sure they are getting emails that tell them that, even though they are supposed to – I am also supposed to get an emails notification when a payment fails, but I don’t.) How about members who are renewing? Should their subscriptions be put on hold? WE’ve had some members whose payment failed, and a previous admin changed their subscription status from on hold to active (a mistake I think?) – should I just change them back to on hold? I’ve looked through lots of the documentation, but can’t really figure out the best practices. It’s confusing.

Another issue: Some members were having trouble paying, getting a message that their email was already in the system, and not allowing them to pay . The workaround was to delete them as customers from the system manually and have them make a new account, which wasn’t ideal. Any way to fix this?

Thanks for your help

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