Sony India — one month taken for repairing the lcd of xperia xa1 ultra

Address:

Kolkata, West Bengal, 700040

I was using xperia xa1 ultra and it fell and broke. I submitted the phone to my nearest sony authorized service center and they told me that 10-15 days would be required for the repair to get done. During these 15 days i called the service center a few times but there was no response and they did not provide me with any information regarding the repair process. On the 16th day, they called me to let me know about the expense required for the process and provide some advance to them. I went to the service center, provided them the advance and they told me some more weeks will be required to repair the mobile.
When i asked them what took them so long to even let me know just the amount, there were different answers from different person. The sony support care told me there was no spare parts available. However, the service center executive told me that the delay has caused due to the shift of the sony head office to camac street. However, when i called another executive in the service center and asked if the mobile has been sent to the sony head office he said no, the phone is with them only. This is clearly evident of the disparity in the different answers. I am worried because i am sure that the initial 15 days have been taken by the service center because either they were using my phone, as it was not dead or they have misplaced some of the authentic hardware parts with fake parts.
Moreover, as a consumer i feel cheated because they have lied to me regarding the exact cause of taking one month for the delay.