Samsung Airconditioner - Split Unit — Indoor Compressor defect

During Winter, I purchesed a 1.5 ton unit. When I started using it in Summer, there was no cooling .After lodging complaints various technicians came home and then they suggested that the unit has to be taken to the service centre for checking . Initially they took the external unit and later the internal unit. The Chennai service centre Based at Anna Nagar headed by Mr. Chellapandian (Service Manager) did welding of the leaked tube of the cooling coil and send it home. Now I find the the fins are bent even though the unit is working. It took over 2 weeks and many phone calls to get the unit back after repair
The question is, if the cooling coil is leaking the product was sent without proper checking from the factory. An airconditioner expert told me that if the internal unit shows defect, the panel shuld be replaced new since in future there can be leak and even the compressor can fail when I will have to shell out the money.

Please help me to clear this mess