IPhone hardware issue

Received a system update and immediately I lost my cellular network. Connecting with apple support got to know that there is hardware issue. This happened on the 1 month post warranty. Got to know from Apple point of sale that if any hardware issue persist irrespective of warranty, Apple replaces the phone with a new one at free of cost. Just wanted to confirm from the community if this is correct? As Apple service center is saying "if hardware problem found then I have to pay around Rs 25k for repair or If I want to replace with a new IPhone 12, I have to pay additional Rs 50k".