Can't get the free month of Premium

[Chrizzy3000]

Hi!
I have purchased a month of Premium and now I got the offer to have the next month for free. When I try to get this, and click "Confirm purchase" (even though the sum is 0) I get the message "wrong password". Why? What password?

[Peter__]

Which offer is this? If it is a 30 day "free trial" (or a buy one get one free) deal, unfortunately you no longer qualify if you already have Premium.

[Chrizzy3000]

Since I got the offer - I qualify. I've seen that others have the same problem.
The deal is that I get 30 days for free and then it's 99 SEK/month.