This is a user forum, not Magix. When you created the post, there was a message that says, "If you have any questions about an Online Shop order, please contact our support" with a link that takes you to Support. You should have clicked on it.
Now, click on the SUPPORT selection at the top of this forum. Select ACID. Scroll down under Orders, Invoices & Returns. Select "Revoke order / return / Right of Withdrawal." Read and do what it says.