Trane Technical Sales interview questions

Trane came to my university campus. A friend and coworker of mine had recently signed for a full time offer. They had mentioned me, and I met their manager in person and he was very interested. I did a phone screening with one recruiter (30 mins) who connected me with another recruiter. The second recruiter asked me basic behavioral questions (~45 mins) and had me fill out an application. This was a very involved process that lasted about a month. I never heard from them again regarding my status as an applicant. I sent follow-up emails, called the recruiter, etc. No response. I'm still shocked that employers will ghost candidates.