Complete the Support Ticket Refund - https://support.avast.com/support/tickets/new?form=2.

It takes about 5 business days, if it gets beyond that post again and we will try to push it further for you. The tickets are handled on a first in first out, so it could push you further back if you submit multiple tickets.

So long as you submit your refund request within the 30 days it will be actioned. How long it takes to be actioned isn’t counted, only when you submitted the refund request.