Burckhardt Compression interview questions

There were 2 interview rounds and the difficulty level was intermediate. HR team seemed very unprofessional as before interview I had clearly communicated my salary expectations of a 50% increase but after clearing all the rounds including HR round where we agreed for a 50% increase but still they just shared the offer letter with a 25% increase only which was totally unprofessional practice as it was never discussed. I would not recommend joining this company as they don't seem to value their employees.