Shocking service - NO service

It is impossible to communicate with Opodo. Under EU law they have to offer a contactable email address which they dont. Neither on the .com nor on the .de website. They offered my a discounted premium which they confirmed and deducted from my credit card. Now I received an email reminding me that my premium membership will auto renew in a few days for the full amount. There is NO way to communicate with them but the super expensive hotline in India where they speak 'English' nobody can understand. It's shocking and violates customer rights. I will escalate this to the authorities if they dont sort this out within the next days.