Sudden increase in contributions

Hello you out there, and although my car was admitted to me by the end of the year but insured by my mother-in-law, now I made an insurance comparison at the AutoBild on the website at the turn of the year and there was Cosmos directly in the first place with 96€ monthly, my pre-veryer requested 133€ so I directly signed the contract online on my name. All nice and good, about 10 days ago came a letter from the Cosmos that please a two-way a copy of my driver’s license (have received my driver’s license on 26.05.2010) so I did this and sent it to you now comes a letter with the new monthly fee of 192€(!!!) there I ask myself how can this be? I have clearly stated in the insurance comparison on which day I made my driver’s license. I really don’t know what to do now, a monthly amount of 192€ would mean financial ruin for me as an apprentice and I don’t know what to do now, a monthly amount of 192€ would mean financial ruin for me as an apprentice. can it be that the SF-Class was wrong? And if so, they would have had to see that I am a newcomer, right? Help me with what can I do? Can I even say to them that they should rewrite the contract to my mother-in-law? Greetings Tobi