Weird issues with Jio

Hello Friends,

I got a Jio sim and put in my S7 along with a Vodafone sim. Jio is in Sim 1 slot and Vodafone is Sim 2 slot. If both sims are on then I am not able to place any calls from the Jio sim, I can't even call a Jio number. I dial a number and that's it no dial tone no nothing. As soon as I turn off the Vodafone sim Jio works flawlessly. The internet works fine irrespective of the fact whether the 2nd sim is on or off. If I turn on both the sims and call the 2nd Vodafone sim the calls goes through, but here's the catch if I call Jio i.e. Sim 1 I get a message that your call is waiting/in queue but I am not using Sim 1 to make or receive any calls. Sim 1 is idle during this and I am getting the call on the screen. Jio Sim was in Sim 2 slot previously I swapped it but the issue is the same. We have a Moto G4 phone at home wherein Airtel is in Sim slot 1 and Jio in slot 2 but everything is working fine. What should I do?

Thanks