He also clarified that the refund process could take up to a maximum of 15 working days.
Three weeks later, I find that my license still shows as Valid in My Account!
Three weeks = 15 working days
At least in theory you should receive the refund "any minute now" as they say.
Keep in mind that when avast has made the refund it doesn't mean you will receive it right away in your account.
It not only depends on avast but also on what bank(s) are involved.
There are, strangely enough with all the automation, banks that don't transfer money between them in the weekends.
Vladimir Hornicek confirmed on 21 Sep that online shop had been notified to refund the amount.
I doubt that since it is not a shop that takes care of refunds but avast itself. I guess you read and/or worded it wrong.
I would say wait till the end of this week and see if you have received the refund or not.
On a side note...
It is a good practice to never mention your email on a public webboard.
Everyone can read it and "harvest" it to send you spam and other mails.