Interconnection Usage Charges is not a new charge that has been levied by TRAI. It was applicable to all calls even on the day JIO launched their services. Infact, it was a very common phenomenon for telecom operators to advertise on-net and off-net minutes in cellular plans before Jio was launched. Therefore, when they launched unlimited call plans with their commercial launch they would have been confident that plan prices are high enough to cover net IUC charges and other costs + profitSo what are you trying to say here that Jio is charging customers exactly what TRAI is charging Jio? Isn't that good and makes Jio's case here.
Please note that Reliance was a new operator while Airtel, Vodafone and Idea had an existing user base and therefore I do not think there would have been a doubt in anybody's mind that Reliance will have to pay other operators for for to settle net ICU charges especially when they launched their commercial services with unlimited voice calls while other operators still did not have competing plans for unlimited minutes.
Suddenly, after 3 years of service Jio has reliazed that they made a boo boo and users should pay for IUC charges? Why do you think that would be the case?