Sanofi H R Operations Manager interview questions

The recruiter engaged with me on LinkedIn. After successful telephone call with the recruiter, I had a telephone interview with the hiring manager. It seemed all positive and was told that I will hear back by end of the week. A week later I received email to say recruiter still waiting for an update. Then two weeks later, whilst I was on holiday I received a call on Wednesday to ask for a f2f interview on Friday despite I mentioned several times that I was on holiday that week. Since then I chased up twice by email and have received no response. It has been over one month and half since I applied and still received no response or feedback. The experience is very disappointing.