merch shop transaction not going through

i know this is a bit of a weird request but i do need help but I'm trying to buy the pacman shirt and the prayer book off of the bigcartel europe store but my payments keep getting put on hold and then refunded, i want help since i really want to get both of these as soon as i can, i even tried to go through the contact section but it gives me the same error of "email cannot be sent, try again later", please someone help!