It can take up to 10 working days - but some delays have occurred over the holiday period.
Provided you have submitted your refund request within the 30 day period it would still be processed. If you can post the Support Ticket ID number in this topic.
Whatever you do, don't submit another or amend/update the existing one - Submitting multiple tickets can actually slow the process as the tickets are dealt with in a first in first out basis. So for now don't update or submit further tickets - refunds can take up to ten working days to be handled.
You can however use the on-line contact form,
http://www.avast.com/contact-form.php?loadStyles to contact Sales.
Put as much information in that as possible - Support ticket ID number, receipt/payment number, email, etc. A link to this topic wouldn't hurt. In the meantime I will try to attract some attention to this topic.