I've been using Svenska Domäner's services since 2011 and it was strange to read those negativ review as I've never experienced any of these issues. I don't even understand what people mean under unwanted withdrawals as they always send an invoice about renewals. What's better yet that they always send a notification about upcoming renewals so that I have the chance to cancel any of my subscriptions in case they are no longer necessary.
It's true that at the beginning I just bought some domain names and that was it so I did not have experiences with advanced services but recently I use all their major services. The customer service has always been responsive and helpful even though it takes longer time to get them on the phone. My emails get answered most often the next day, the latest I had to wait was 2 working days which is fine with non-urgent cases.
I'm not aware of any emails sent by 3 party which would not have arrived.
Altogether my impression of Svenska domäner is overwhelmingly positive and I recommend them.