Whatever value you get in getOHLC is correct, on charts 17th November 2017 candle will have today's close and since markets are not closed, it keeps updating to the last price of the instrument.
In order to verify you need to look at 16th November 2017 candle and not 17th November candle.
For SBIN (NSE), It returns
"open":345,"high":346.7,"low":340.1,"close":333.4
When I referred the chart , the value of SBIN (NSE) at 16 th November 15:15 PM,
"open":332.70,"high":334.10,"low":332.50,"close":333.95
In order to verify you need to look at 16th November 2017 candle and not 17th November candle.