Micromax — Misleading with wrong information and delaying the service

Address:

Bangalore, Karnataka

I had given my tab to micromax service center on 20th June 2015. I was told that I will get it in 1 week's time. After 1 week when called them they said that it will take another week. I repeated got this reply till today.
I sent a mail to micromax customer care explaining the same. I told them I need it by Friday (17th Jul). Then they replied saying that it is ready and can be collected as per my convenience. I went on Saturday but it was closed. I went today and I was told that it is not yet ready.
If the device is not ready then why did they gave me wrong information.

Why did they often give me the wrong details about delivery every time.

Last how many days will they require to return the device.
No: [protected]
Mail: [protected]@gmail.com