What was the ticket ID ?
The turn around was about 7-10 working days, but that can depend on your payment method ?
Whatever you do don't - Submit multiple tickets, this 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.
If you can post your support ticket ID then I will try to attract some attention to it and this topic.
NOTE: that the support ticket system has been revised and moved to a different server, so it may appear that it can't be found. But it should still be their and avast should be able to access it via the ID number.