RTO India — Commercial car fitness certificate has not given

Address: Assam, district, nalbari

My car hasn't fitted with speed limit device.the device do fittes one centre in my state ..my district is not under that center..how can i install .the centre has allowed only 2 districts..motor vehicle inspector has no knowledge where to install very often said to me asked for the device..my question is how n where from get the device..rto office has not any reasonable answer n get red off from their responsibility..i have got a big trouble ..where can i lodge complaint n get solution.. officer is a very rude behaviour person