Contributions liability 105 Euro for 1 week !

The following case: had my car insured with the Asstel for years. This insurance was dissolved, as taken over by the Gotha insurance. I changed my vehicle in July, and the new one insured unnecessarily with the Gothear. However, since the insurance fee was far too expensive for me, I resigned shortly, and my vehicle now registered with Bavaria Direkt. Now the day before yesterday from the Gothaer a bill about liability of 18.7.-25.7. without details of insurance. In addition, I drive a Renault Megane 1.2, and no Ferrari or the like. Something is not right, had reckoned with 20-30 Euro. How do you see this?