I received an improved offer via email with a 100% bonus and 200 spins. There was nothing in the email about activating and if you clicked on the link you would be taken to the deposit page. I paid 30 euros via bitcoin and didn't get a bonus. The chat said you have to "opt in" beforehand and supposedly you can’t add the bonus manually afterwards.
This is probably the only casino where that doesn't work....! Especially since the error is yours because there is nothing about activation in the advertising email. It's a shame, that's how you scare away new customers.