Very poor manufacturing Several Software issues

Very poor manufacturing, several software issues which I'm facing from the time of delivery,very poor milage only 8.1kmpl I'm getting. Several wrong indications has been coming and going in the display while driving,touch screen gets hanged often,very often left speaker stops working For the past 6months from the date of purchase I face only problems which forces me to stop driving this car .. I need an immediate solution for this problem and please don't purchase Tata Harrier in ur lifetime