Micromax — Didn't get proper service in micromax service centre panjim.

Actually my was not getting on so went to the micromax service centre panjim goa they said that they need to replace one part and they demanded 750 rs to remove password. immediately i contacted costumer care at micromax and they said to remove password they charge not more than 150 rs. i told them that my phone is under warranty so please replace that part and i will pay you 150rs they refused and gave me my cellphone back in the same condition as i have given to them. and its was rude behaviour. please kindly look in to this matter.