MakeMyTrip India — Payment not received for wrong cancellation

Issue 1 :
For my BLR-SXR flight on April 21st, I had cancelled 4 out of 18 tickets for which I have not received the refund of Rs9604 yet.

I have received the below messages from MakeMyTrip
20 April Message
Cancellation for MakeMyTrip Booking ID IN1B[protected] is successful. We would initiate a refund of INR 9604, once we receive the refund from the airlines*. Timelines for refund are dependent on your bank/card/wallet provider. Thank you.Team MMT.

17 May Message :
Cancellation for MakeMyTrip Booking ID IN1B[protected] is successful. We would initiate a refund of INR 4270, once we receive the refund from the airlines*. Timelines for refund are dependent on your bank/card/wallet provider. Thank you.Team MMT.

Why is there a change of amount from what was agreed during cancellation.

Issue 2:
For my BLR-SXR flight on April 21, I had cancelled 4 out of 18 tickets, in which there was a wrong ticket cancelled.

Requested for cancelling below 4 tickets

1. MR SHIVAPRAKASH R

2. MR PRASANNA KUMAR H R

3. MR SRINIVAS R

4. MR RAVIKUMAR K

But Cancellation was made for below:

1. MR KUMAR G

2. MR PRASANNA KUMAR H R

3. MR SRINIVAS R

4. MR RAVIKUMAR K

Wrong ticket is cancelled due to which i had to pay the full amount on the day of travel.
Need compensation on the ticket amount.