If you mean request a refund, you have to do that before 30 days.

You can submit a support ticket - Try the following:
https://support.avast.com/Tickets/Submit/RenderForm/27/&cls02&ptf01&lic01&scr06

It can take 5-10 working days to get a refund - Just submit one ticket - Submitting multiple tickets can actually slow the process as the tickets are dealt with in a first in first out basis.