If you have reported a problem and CGT has done nothing about it, you have every right to sue CGT and ask for financial settlement. Since they do not want to prevent theft, they support and allow stolen property to be sold through their platform. Such cases are easily won in European courts, but do not expect more than 3000-5000€ in settlement. If even after the verdict they do not solve the problem with the stolen assets, you can sue them again and literally destroy them financially in court. European courts are very rigorous when it comes to financial fraud and misuse of intellectual property.