Honda Unicorn — not keeping up their promise

i am a militry ex service man where i can buy any items in csd canteen. i gathered some money to buy a vechile where i made a payment to purchase honda unicorn on 30.10.08 in csd canteed when i went to the show room they said it will take two months to reach me, where they have not mentioned it to us before paying the bill(Didar honda show room in mount road chennai) when i checked with them now they are telling me that it will take 3 months from now. and they said to complaint to any body and they are ready to face it. i got this news from mr singh who is the manager of that show room. where i checked with other show room they said it will take three weeks to deliver the bike. this made me vey upset