Consumer forum complain against oneassist is not returning my handset

I have purchase a Mi protect plan (Mi.Com Protection Plan 6000-8000) while purchasing mi redmi 2 mobile phone which has been manage by oneassist.

Recently my mobile phone screen was damaged so i claimed the insurance and the claim id is SR#1355143 which was issued by March 31 2016.. my claim has been approved and oneassist also picked up my damaged phone from my home .

then they have given me estimate to repair my broken screen and asked me to pay INR 312 as processing fees which i have already paid to them .

its been almost 3 months i haven't received my mobile phone back with new screen.

on 5th june one assist executive came to my home with similar device which i was submitted to them for claim but the phones imei number and serial number was not matching so i did not accept the phone since it didn't belong to me to get a answer i called oneassist customer support and raised my complained regarding same but they did not had any update on the situation although they told me they will look in to the matter and correct it.

I waited for their answer but no one bothered to update me on situation after a week i again called oneassit customer support and raise my issue but again the team did not had any answer.

After few days again once assist try to deliver me the mobile phone which didn’t belong to me , I asked the executive why you are again repeating same mistake so the executive ask me to call his superior Mr Sangram 7738078119 I asked him why I have been delivered the handset which doesn’t belong to me . Mr Sangram answered it has been given as a temporary phone as courtesy to use it . then I immediately called oneassist customer support to ask explanation why they are not giving me my original handset back its been already more than 2 months delayed, but like always they did not had any answer they told me they will check with backend team and let me know after calling them multiple time they told me the handset iemi number and serial number has been changed because they have change the motherboard of my phone .
I asked them why they have changed my mother board when the claim was made only to replace the screen. The oneassist executive replied my phones motherboard was damaged that’s why they had to change. I told them I was never notified for such damage the only problem with my phone was the screen for which I had raise the claim neither I mentioned them that mother board is faulty in my claim or oneassist told me or inform me in 2 months tenure that there is problem with motherboard the estimate was only given for broken screen.
I have told them strictly I am not going to accept such device in which they have made changes in my motherboard it may lead to future problem and I need brand new phone replacement my phone was only 2 months old it never had any motherboard issue this is not acceptable.

I have been following up with oneassist since almost 2 months now, to give me back my handset their call center representative never had any clarity on the situation they always fail to give me a proper solution I have all the recording how the one assist customer service has harassed me pls help me get back my handset replacement at any cost I will not accept the handset in which they have change the mother board .