Who manages Delinquent Churn, Invoice collection, Cancellation Calls?

Morning everyone! 

We currently have a gap in our company of who manages delinquent churn, invoice collection, cancellation calls etc. We are a small (ish) team in New Zealand of 21 people so currently, this sits between accounts & the customer success team.

We are aiming to move this process out of the accounts team and keep them more for internal accounting purposes and then have someone responsible for this role who can also have product knowledge so they can provide value to these customers and help them if the situation occurs. 

I wanted to know whether:

• Anyone has had any trouble with this?
• How did you handle it?
• Do you have a dedicated role to manage this? 
• What else was this role responsible for? 

We are trying to eventually automate a few of these processes which will help in the long run, however for now our company focus for the next 18 months is on the product so we need to put in a solution before we can automate. 

Looking forward to hearing your thoughts!