TK post master studies

Hi everyone!
A month ago I finished my master and as expected TK my insurance contacted me because they knew somehow that I finished the master, they said that we have to change the price (I'm 23yo and that was my student tariff). Today I received this letter with the new price of 260!?????!!!!! I am so freaking scared of this, Im not german ofc I have savings for few months which I'll use while I find a job but this price was incredible unexpected for me. Is this the regular price??
I simply dont know what to do, a private insurance I suppose will cost the same?