Experience taking new car to service centre from showroom directly

I am one who experienced what I mentioned in the title. After waiting for more than 40 days and with continuous follow-up, I went to take the car delivery with my family. During the delivery ceremony, we noted that DLR was not working. They asked us to wait so they could fix it. We waited for more than 4 hours without lunch and no proper update, and they said they need to take to bodyshop now. Finally, they asked if it got fixed. I can take delivery, but again, the issue popped up with the new Right indicator not working problem. Don't trust Tata products. Totally unreliable one. What QC and PDI have they done here?