Valid IPA, but deported by immigration

Hey,

I had a valid IPA but my entry was denied into Singapore. In the immigration counters, They questioned me ' what is your name?' I replied ' Tarun Kumar' . They checked again and questioned ' Are you Tarun Kumar cadona?' I didn't catch the name properly. They asked me whether I have studied or visited Singapore already. I replied ' No'. Then, I was asked to sit in a room. Close to 50 mins later , officer started interviewing me . She asked ' who gave you the IPA Letter?, How much SG currency you have, How much Indian currency you have, what is education?, What is the salary and what role you are going to do in SG? For all these questions, I have answered. I have never heard from my friends that this interview happened for them. Then, they took me into the 2nd screening room for my biometrics. Again I was put in the same room. I waited for 45 mins this time. An officer came to the room and showed a passport copy of another person having my same name 'Tarun Kumar' and asked do you know this person? I replied No. Then the officer said ' you are denied entry into SG, you should catch the next flight and leave'. I asked the reason. They said they are not suppose to provide it. They said there is something wrong with IPA and your company needs to get it corrected. They refused to provide details on what is wrong in IPA.
My IPA is approved by ministry and I travelled within the timelines to SG. I don't know what is the real reason to get deported. They mentioned me to file an appeal and re-enter SG. A strong case is already given to the ministry by my company.  Will I get a positive response or should i move on?