Can I see the mandate somewhere?

This depends on your bank, but for most Swedish banks the mandate can be found when logged in to the internet bank. 
fraud@trustly.com
https://cdn.desk.com/
false
desk
Loading
seconds ago
a minute ago
minutes ago
an hour ago
hours ago
a day ago
days ago
about
false
Invalid characters found
/customer/en/portal/articles/autocomplete