This was Lajong's second straight win of the season while Mumbai slumped to their third defeat on the trot.
Dicka gave the home side the breakthrough in the 28th minute and followed it up with another goal three minutes before the half-time break. Later, Chinglensana added a third in the 70th minute to seal the tie for the hosts.
For Mumbai, Karan Sawhney scored the lone goal in the 56th minute.
Mumbai started the proceedings on a positive note, creating several chances in the early moments. The home side were left doing the defending job for the most part of the first 30 minutes but things made a paradigm shift thereafter.
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Just when Santosh Kashyap's boys looked like getting back into the tie with a couple of decent raids on the opposition half, Dicka killed the first half contest with his second strike in the 42nd minute.
Following a Mumbai defensive lapse, Dicka was left alone on the left and went past the advancing goalie to convert with ease.
The Mumbaikars had their hearts in their mouth when Issac hit the top of the crossbar in first half stoppage time. The two sides went into the break with the score 2-0 in favour of Lajong.
Hopes of a strong Mumbai comeback was, however, shattered in the 70th minute when Chinglensana netted the third goal for Lajong. Chinglensana spun over to put the ball into the back of the net following a corner kick much to the delight of the 5000-strong home crowd.
Things became worse for the visitors when their custodian Laxmikant Kattimani was shown the red card for handling the ball outside the box.
Following the victory, Lajong catapulted to the fifth spot in the league table while Mumbai slipped to sixth.
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