Yandex Summer Software Engineer interview questions

At first I recieved 3 problems for 2 weeks. I solved them and after a month recieved a new problem set. I submited it as well and recruiter scheduled phone interview. But in specified time nobody called. I asked recruiter, she said something like that: "Our developers were too busy to interview you and all intern positions are already filled, but your work was highly graded". I wasted a lot of time into nothing.At first I recieved 3 problems for 2 weeks. I solved them and after a month recieved a new problem set. I submited it aswell and recruter scheduled phone interview. But in specified time nobody called. I asked recruter, she said something like "Our developers were very busy to inerview you and all intern positions are already filled, but your work was highly graded"