Ok, latest update. Mayzus is ignoring as well even though they should have an organized complaints policy in place, as they state themselves at:

http://moneypolo.com/our-complaints-policy/

This is the error I get in my inbox  when sending an email to the address specified on the page about this:

The reason of the delivery failure was:

Unknown user


Okpay still doesn't provide a realistic answer to all the requests.