Only the fees published on their website are applicable. Appointments should only be booked through them.
The Embassy warns to use any other service providers or online services. They are most likely NOT GENUINE! Visa application forms, information sheets are all offered FREE OF CHARGE.
Incoming remonstrations are currently subject to significantly longer processing times. It is currently not foreseeable how long this situation will last. This also applies to inquiries about the status of remonstration procedures. Instead of filing an appeal, there is always the option of submitting a new visa application.