Sony India — missing wireless mouse dongle

My name is Prakash C Menon a media professional.My contact no is [protected]. I am regular customer of sony different products.I have used sony vaio laptop.(model no SVF15212SNW IN[protected].i was purchased this product from a retailer in Kochi, Kerala.Due to system slow, last week I went to Madona Electronics, sony authorized service centre, toll junction Edappally, Kochin for servicing.Today i got my system back, but missing my wireless mouse dongle.I called service centre and talked to service person.but i dont get a proper answer from service section.I still believe the brand Sony.I felt so bad experience from sony authorized service centre.This is a small issue...i know...but so bad from Sony. my job no was-j[protected]date[protected]serial no was 0022239. i am not sure about i get back my dongle.But i just share my feelings. thanks and regards, Prakash C Menon