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Feedback on a completed service case

We always want to improve. That's why your opinion is very important to us! Here you can leave us feedback on a closed service case.

In order to be able to attribute your feedback to a specific case, we need the serial number of the device concerned.

Fields marked with Asterisk (*) are mandatory.
Please enter the serial number of your device. If you need help, please use the link below.

Here you can find some support to find your serial number.

Your data

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You are stuck or have further questions?

In this case, our contact persons will be happy to assist you personally.

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