Formal complaint

I am a EU student doing an MSc at a Russell University. I am considering a formal complaint because I applied for a PhD and I was never called to pass through the formal interview process etc. I decided to check on the status of the application three months later and I was told that the funding for the project was given to someone else. I got mad because they did not specify why I was the only applicant to not get a response on time. I mean the successful applicant did not have any problems going through the formal process for selection. I have not fully understood who was responsivble for the mistake:the supervising professor, the student services or someone else. I intend to drag the matter to the highest authority if necessary to demand a repeat of the formal process. What are your thoughts on the matter?

I am a EU student doing an MSc at a Russell University. I am considering a formal complaint because I applied for a PhD and I was never called to pass through the formal interview process etc. I decided to check on the status of the application three months later and I was told that the funding for the project was given to someone else. I got mad because they did not specify why I was the only applicant to not get a response on time. I mean the successful applicant did not have any problems going through the formal process for selection. I have not fully understood who was responsivble for the mistake:the supervising professor, the student services or someone else. I intend to drag the matter to the highest authority if necessary to demand a repeat of the formal process. What are your thoughts on the matter?