Morris Garrages India - Damaged alloy wheel during vehicle service and then tried to decieve me

My MG hector car was given for service last month before the * year warranty was to be finished. During the service, the service center used some chemicals which corroded my alloy wheels. When i inquired about this, the GSM explained that this is common in MG hector cars of * years old. He also said example of such corrosion even if a dog pees on the alloy wheels.