Apple India — Apple Watch service issue

I am having a Apple Watch 5 series 40 mm . It’s just 1 yr 2 month old . Suddenly when I was using it the watch stopped working .And I went to the apple authorised service centre and they told its having some display issue . So I asked them to repair it but they said they cannot repair it, they can only replace the whole watch by giving an additional amount of 35k . If they cannot repair it then why are they selling these watches .
After few months I got my watch repaired from a nearby mobile shop
If these shops can repair then why the apple company cannot repair it