Toyota — corolla altis

Address:

Mumbai City, Maharashtra, 400066

I m not satisfied with the reason of engine sound on complaint done to millenium toyota, the sound noticed after my 50000 km service which the service attendant replied it is due to wet ness of the belt / some dust particle on the surface of the belt running on pully on side of engine. The sound sometimes very noticeable and sometime it becomes very silent. I have not heard of such noice since i have purchased the new vehicle. I would like to know the root cause whether it is something wrong with the engine or your authorised service station is finding a reason to pass the time of three years and than suprise will come for paid repairs of engine. Request your immediate action to these cause