Their so-called “VIP managers” encouraged me to deposit more money by promising bonuses and special treatment — clear psychological manipulation of an addicted player.
Sorry to read about your experience. What these casinos have done is not only unethical but also clearly illegal, and it's devastating that they preyed on individuals who are taking active steps to protect themselves through self-exclusion.
Some steps you can take are filing a complaint to regulators, initiate a chargeback, or take a legal action while seeking support from gambling support organizations in Germany.
Stay strong and document everything. I hope other people may learn from your experience.