We are a small-scale limited company based in Germany selling home textiles and kitchenware. We do an average monthly marketplace turnover of around 45,000 EUR. When we logged into our seller dashboard this morning, we were met with a nightmare. A session was opened without triggering the two-factor authentication prompt at login, and we saw that our registered bank account details (IBAN) had been changed.
To make matters worse delivery addresses for about 14 pending orders placed over the last 12 hours appear to have been tampered with and redirected elsewhere. We immediately changed the password and reviewed authorized users, but we're still not sure if an unknown active session is lingering in the system.
We're in the first hour of this and want to take the right steps without panicking. What is the step-by-step process for account recovery, freezing payouts, and explaining the situation to customers?