Air India — entertainment unit not working on 14 hr flight. 3 consecutive times

I flew in ai 191 and ai 102 new york mumbai and delhi recently and both the times my entertainment unit did not work. Employees refused to provide any alternative inspire of empty seats available in economy as well as business class. I have faced this earlier also, there is nothing air india is doing to comfort the passengers. I was a lone traveler and it is difficult to manage on such long flights. I was told 150 units were not working. Please do something about this