Hello, i am really sorry to hear this as i spent over 10 hours on solving your issues in the updates that i asked you to install. I will reply to the points of the issues that you mentioned:
2) duplicated order history - yes it is true that even standard Virtuemart checkout inserts two pending statuses into the order history - we now only insert one of them, all other updates are caused by payment plugins
3) completely wrong selection of the shipping costs - we've never heard about this bug.
We always provide refunds in cases you are not satisfied with our component and we cannot fix any of the critical issues, but please don't expect 100 hour support for 50 euro.