Maruti Suzuki India — Poor response to query of customer

Address:

Mumbai City, Maharashtra, 400706

I have purchased maruti celerio in month of jan 2016
During its first service i have been charged towards introducing the ac cabin filter.
I was not convince about the scheme " how ac cabin comes under standard accessories - opt to have?" it must be a integral spare part supplied along with new vehicle.
Not sure about whether maruti is not providing or dealer (Auto motive) removing it for his own interest?

Asked concern to revert with simple statement
" yes, maruti sell the celerio model with out ac cabin filter"
Its about 2.5 month to receive any reply

Not aware to whom to address this issue and get satisfying answer on all above