for them to get divorced, they have to be LEGALLY married first, i didn't see them sign and marriage licence/certificate? i;m not sure how the law work in india, but i assume that it takes more then a religious ceremony to be LEGALLY married.
but being a ekta show (kinda regressive) evenryone one will agonize over the wedding and think there no solution.
heres the solution just perfrom the religious ceremoney again with kt and lakshya and then have then sign the marriage licence/certificate and have then go on there marry way.
ignore the religiosu ceremoney that happened between kt ands eklavya, that would be the easist thing to do.