Elica — Gas stove and Chimney

We purchased a 4 burner gas top and chimney from Elica Expecting good products and services..
but in turn the gas stove started giving us trouble in less than 3 months, first one burner stopped working and now 3 out of 4 burners and even knobs are not working.
the service is slow that no one would turn up even after 1 month
if they come too they will tap on stove to make it work and wont change anything at all... even though we show the problem, they do service like local stove cleaners and from next day the same issue persists.
we faced a hazardous experience too because they didnt fix it properly