Like i said there is only one way the payment wouldn't be processed and that is if he either sent the incorrect amount or paid a too low fee. I don't see how i am responsible.
If it was our system that was flawed then i can see the issue, but after you there have been customers who successfully paid with bitcoin on our site as they have always done for many months if not years.
Like i also clearly explained to him, the payment processor has his money and not me. He will have to contact the processor via info@mollie.nl or contact them via phone even and tell them the details of his transaction (i can't, i don't have his email, ip of mollie, blockchain link, time of payment, country of payment, etc etc).
- Kaii