You said you "offered them numerous alternative routes...incl VS own route that VS is selling on website - BOM-DEL-LHR." That route was properly denied and you had no expectation for that route. By bringing that route up, you should expect failure.
You did not say they offered you no alternative routes.
Your tone and lack of clarity here may also be impacting your experience with Delta.

It's unclear what cabin you want and how many tickets, but the only chance you have is if Delta gets its partners to open award inventory on the BOM-AMS and BOM-CDG flights--which would be 25 hours of travel. They may be successful, they may not. But being nicer than your tone here and in previous thread would certainly help. Contrary to the misstatements people have made here, they do not have any obligation to do that. They have an obligation to rebook you for sure....on something. They did. You dont like the options that have availability, which is a 36 hour option. Accusing people of cheating and similar invective is only going to get people to put you on hold ans say "Oh that's awful, let me see if I can plead your case," go to the bathroom, and come back and say "You know I wish I could help you but its out of my hands darlin"

As for people posting about VS, VS is going to be out of the loop here. There's no routing DL can get for OP on VS he would deem acceptable; all would require an overnight in LHR or JFK