I have over 20 years of work experience in IT field. I left a job, where I was an IT senior manager for 5 years, to join a startup company. During the interview process I was given a title and promised certain roles and responsibilities. However, after taking up the position, the roles and responsibilities (even the domain) were totally different. In addition, I found out that the department that I was assigned to was using large number of unlicensed copies of commercial software. I reported it to my boss and I was asked to ignore that for the time being. Finally, I decided that it was best for me to quit that job because I discovered few more things going there what I stood against throughout my career.
All my other experiences were long-term (minimum 5 years and maximum 13 years) and had a great work history. However, my latest work experience lasted only for 8 weeks. I am not sure how to account this history in my resume and/or future job application. During my exit interview, the executive, who hired me "advised me" against showing this work experience when I seek for new jobs as it could severely impact my chances.
I am planning to show this history in my job application but not in resume as this experience was not relevant to what I was doing last 5-6 years. I also do not want to go into very details (such as unlicensed s/w, etc.) of my quitting. I would like to seek some guidelines in this regard. Thanks!