We buy cars took four months without natis documents to me and the license disk has expired now

I bought the car in December 2021, it's April 2022 now and I haven't received the documents and the car's license disk has already expired. The company is so unprofessional. I was promised the car's papers 16 days after buying the car, now it's four months later and I don't have the papers, and the license disk has expired. What a horrible company this is. Have never seen anything like this.