Delay in payment and accumulation of the amount of Rs50 Lakhs to be paid is mistake on your as well your legal advisor (Advocate) part, even if we take for the sake of argument wrong order was passed by the Ld MM Saket Court, it was your duty to pay the maintenance amount to avoid accumulation of the amount for next 3 years, your advocate should have advised you to continue paying the maintenance to the wife. Even if at later stage if it was held by the appellant court the maintenance allowed to wife was wrong, at least the child maintenance still would be held as correct, the amount that was paid by you for both wife and child would be got adjusted for child maintenance for future.
The judicial process is extremely slow in India in general and Delhi specifically, this well known fact all lawyers practicing in Delhi know, why your advocate did not tell you this fact, was he just charging his fee not informing ground reality?
The matter is in Delhi High Court that will not be soon decided unless you request the bench for amicable settlement through mediation and conciliatory centre of the High Court, where try to work out lump sum amount for settlement of all dues and withdrawing all matters from the trail court and even if wife seek decree of divorce from Indian court agree to that too even if there is decree of divorce of Singapore court with you.