Vasanth & Co — Refrigerator smell and waste water tub unable to clean

I have buyed whirlpool refrigerator in vasanth and co in back side I have seeing small tub for collecting waste and I am not aware of that.last one week it was very bad smell and I was searching my home around finally I found that back side of the refrigerator.i have contacted to service centre for replacement but they not ready to do that.it is very dificult to clean every month.so I need replacement with other refrigeration.thanks