Brandwatch interview questions

I was contacted on LinkedIn by a talent recruiter of the company in Copenhagen. He offered me a student job position as a Junior Developer (requirements were basic knowledge of html/javascript). I met once with him and everything went fine. I met again the next week with some developers and they decided to give me one test. The test was actually for a Senior Developer position (requirements were AngularJS and NodeJS) because they saw that I already had good knowledge of html/javascript. They told me that I could have that position if I made everything perfect. So I spent almost two weeks of holiday by learning two new frameworks and completing the test which I correctly passed. They told me to wait one more month to know more about the next steps. Then they totally disappeared (they never replied back to my mails), making me lose almost three months of time and declining other job offers, though they always gave me positive feedback during the interview process. Worst thing is that I was contacted by them at the beginning! The interview was a huge loss of time and energies for me, so be careful if they contact you. Even though they tried to look nice and super-friendly when we met by person, at the end they did not have any respect for me, without even explaining what went wrong or at least saying "Sorry but we chose someone else". If a talent recruiter contacts you, be aware of this!