Indian Railways — 2ac coach replaced with 3ac

Address:

Kottayam, Kerala, 686001

I had booked 2 ac in nil to tvc rajya rani express (16350) on 5/11/17 @ tatkal quota, travelling dt: 06/11/2017. When i reached railway station tte informed, '2ac coach not available today' all 2ac confirmed tickets downgraded to 3ac, tte issued a certificate no.473165.
Its not the first time such a replacement done by indian railway on this same train. This is repeated several times in this train 16350. We need better travel facilities.