Daily Inconsisteny in Historical data API response

Daily i am observing Inconsisteny historical data API response. I have checked others' quries before writing this and you people always mentioning "we sent to our data team:, "We are working on it" so on... since months..
Still how many days your tehnical team will take to stabilize the platform even servers are running in production stage... This is not a testing/staging or pre-prod, replica .. You are dealing with real real money of customers... This type of unreliable data may lead to loss to the traders.
By the way.. I am sending sample data taken 7th Feb , 2019. Give me the technical explination(other than regular answers) about this impoper response from server...
My requirement : I would like to get very first 1- min data of Nifty future(active contract) for that perticular day by using historical data.(FYI.. i sent the request after 9:16AM of course and requests are under the rate limit set by your side) Below are the various responses for different types of queries:

Case-1:
Request : from time: 9:14:59 to time: 9:15:59
Responses (Out pur reformated to csv of OHLCV):
02:02:55 PM - "11080,11088.5,11079,11079,97275")
02:02:59 PM - "11080,11088.5,11079,11079,97275")
02:03:05 PM - "11080,11088.5,11079,11079,97275")
02:03:06 PM - "11080,11088.5,11079,11079,97275")
02:03:07 PM - "11080,11088.5,11079,11079,97275")

Case-2:
Request : from time: 9:14:59 to time: 9:16:00
Responses (Out pur reformated to csv of OHLCV):
02:01:30 PM - "11082.7,11088.4,11079,11079.1,98250")
02:01:31 PM - "11080,11088.5,11079,11079,97275", "11079.9,11093,11079,11092,61650")
02:01:32 PM - "11080,11088.5,11079,11079,97275", "11079.9,11093,11079,11092,61650")
02:01:33 PM - "11080,11088.5,11079,11079,97275", "11079.9,11093,11079,11092,61650")
02:01:34 PM - "11080,11088.5,11079,11079,97275", "11079.9,11093,11079,11092,61650")
02:01:36 PM - "11082.7,11088.4,11079,11079.1,98250")

Case-3: (NOTE: Server Rejecting valid request some times)
Request : from time: 9:15:00 to time: 9:15:59
Responses (Out pur reformated to csv of OHLCV):
02:04:42 PM - "11080,11088.5,11079,11079,97275")
02:04:43 PM - "11080,11088.5,11079,11079,97275")
02:04:45 PM - "11080,11088.5,11079,11079,97275")
02:04:46 PM - "11080,11088.5,11079,11079,97275")
02:04:47 PM - "11080,11088.5,11079,11079,97275")
02:04:48 PM - :"ERROR:NIFTY19FEBFUT -Error transferring https://api.kite.trade/instruments/historical/9029378/minute?from=2019-02-07+09:15:00&to=2019-02-07+09:15:59 - server replied: Bad Request"
02:04:49 PM - "11080,11088.5,11079,11079,97275")

Case-4: (NOTE: High rejection responses rom server after 50 requests , Rejection ration 3:5)
Request : from time: 9:15:00 to time: 9:16:00
Responses (Out pur reformated to csv of OHLCV):
01:57:50 PM - "11082.7,11088.4,11079,11079.1,98250")
01:57:51 PM - "11082.7,11088.4,11079,11079.1,98250")
01:57:52 PM - "11080,11088.5,11079,11079,97275", "11079.9,11093,11079,11092,61650")
01:57:54 PM - "11080,11088.5,11079,11079,97275", "11079.9,11093,11079,11092,61650")
01:57:55 PM - "11080,11088.5,11079,11079,97275", "11079.9,11093,11079,11092,61650")

Why i am i getting this different responses(data) at diferent times during a day for same (and valid) request query?