assistant

I am a govt. employee in India and I think that according to shariaa haj is fard on me as I have enough money in my Provident Fund account.During the period of haj I was sent to mecca by the govt. on deputation as haj assistant to serve at Indian Haj Mission.  While applying for this post it was clearly said that I will not be allowed to perform haj. However, when in mecca the office allowed me to perform haj.  I performed haj and I had already performed umrah after landing in mecca.  they did not give me the consent in writing but only verbally.  The question is that whether this Haj is valid or not.  Even if it is valid whether my fard haj is performed or not.  I have not paid any expenses for coming from India as I was on duty the fare was paid by the office and I am even getting salary. Whether it is necessary to pay all expensed on my own for performing haj.  Please clearify if I have to perform haj again my fard haj.thank you. Jazzak Allah.