Debt Management WooCommerce

We have an existing debt management system which use woocommerce data, stripe and gocardless data to charge customers and also send emails/letters.

We wish to do the following:

1) Gocardless, auto retry if debt is owed
2) Mark a customer in Gocardless as DD Cancelled if their subscription is not active (using the company name field)
3) Send and amend our letters and emails.
4) Add SMS with payment links to improve chance of payments
5) Create a call system which summarises the customers debt and allows for payments to be taken within the viewed screen.