Couldn’t reach Customer service in 1 month
I had problems activating my account, and it took me 1 month to get a autogenerated email response about how to solve it. (No solution though, account still is not activated)
Context: The option of chatting with the customer service team without an activated account is not obviously positioned on the site (it is not listed with the contact possibilities, but only way below, underneath the feedback survey).
Since I only found this chat-without-app option through n26‘s response to this review, I had sent emails with my inquiry for support. The claimed email response time is 48h, however, it took almost one month to get a response to my email. 
Worst start you can imagine when opening an account with an online-only bank.