Xiaomi India — the phones service taking too long and not getting a valid justification from the part of company.

I submitted my redmi 5 at the service centre in kochi on 2nd November 2018. It had several complaints like
1. Phones contact were getting deleted automatically day by day.
2. when I type and save, the punctuation marks were getting replaced.
3. fb profile picture of my friends was getting exchanged.
4. several contacts displayed in my WhatsApp were not shown in phone contacts.
It's not even 1 year since I bought this phone. I bought It on 20.04.2018
before the completion of 6 months itself, I had to visit the service centre, and the complaints weren't resolved. since I have exams, and my notes were on the phone, I had to wait for a month to revisit the service centre. I went there on 02.11.2018
At the service centre, they made me wait for 4 hours for no reason. At last, I submitted the phone there. They are not giving me a job sheet, they are only giving me a service record. People at the service centre is telling that the service record will serve the purpose of a job sheet. but when I check the status of service online, it is displaying that my phone has already been delivered. whenever I call at the service centre, they are not picking up the phone. I had to call the customer care several times, and nothing was working out. As of 13.11.2018, it's been 12 days since I submitted the phone to the service centre. The only information I get is that it's a kind of software problem. since the company, has failed to resolve it in these 12 days and since there is no progress in repairing my phone, I request to have the repayment for the phone. since the company is so irresponsible for the customer service, I find no reason to use this brand further. I need a repayment as soon as possible so that I could buy another.
I registered a complaint at redmi itself and the
complaint Number is: WOIN[protected]
service record number is: WXIN[protected]