Somehow I dubble bought 2 of the same stash slots..

Hi support of GrindingGear,

I accidently bought 2 of the same stash slots. Number 6 and 7 are the same. Can you remove it for me and refund the cost of it?
Or can I somewhere do it for my own?

https://imgur.com/tesqEcG

https://imgur.com/QAlpSvG