Well, handling time for a ticket is currently +/- 15 business days.
Way too long and it sucks big time in my opinion, but I can't change it as I'm not working for avast.
All I can say about that is have patience.
Good thing to disable the auto-renewal.
If you have your administration in order, you already know when it is about time to extend a subscription
No need for avast to do it automatically.
By the time a subscription is about to expire, "shop" around to see where you can get the best deal.
It could be one of the distributers/resellers has a nice offer at that time.
avast is always charging you the full price.