TANs (Transaction Number) can only be used for personal transactions. Your bank will never ask you to enter a TAN for prize draws, security updates or to refund money to your account. Hence, please always use caution if you are asked for your bank details or a TAN when you are not actually making a transaction.
If you ever suspect that something is not quite right with your online banking account: Block your account. To do so, either contact your bank directly or call our emergency security helpline at 030 869 869 57. This number can also be called from abroad.