The pay was essentially only the minimum wage for a lot of stress and potential abuse through customers.
There is a bonus payment system in place but those goals can be very hard to reach consistently.
You have no control over the current situation, a week can be calm and you do everything right until someone changes something unannounced and suddenly you are flooded with calls that you do not have the answer for yet because it is still working itself down the pipeline.
The company is so big that calls for documents or official communication take forever or get lost, for instance, i never recieved my reference (Arbeitszeugnis).