APEM Ltd interview questions

The two chaps interviewing me were very pleasant, however I was expected to prepare a 15 minute presentation for the interview. They would not discuss salary for the role until the end of the interview. Having put in a significant amount of work for the presentation, I discovered that the salary for the role was £15,000 less than the expected salary I provided. It is extremely disrespectful and disingenuous to do this.