Vivo Mobile India — Vivo v 25 pro

I had purchased my vivo v25pro phone 1.5 years back at 35000.Today i got green line issue after update, i went to the service center they told me that they will charge 12000 for the phone...I asked them that this is not my fault it happened due to the company but still they refused saying that there was a minor dent...Even if there was some physical damage which i got almost 5 months back...It did not affect my phone and it was very minor...Why are they charging money for something that is their fault ...12000 for a 35000 phone that is very bad...Many companies are offering free replacement for their phones getting this...Pls help me government and vivo