Idea Cellular — Calling accounts

Address:

kolhapur

I have idea 4g sim .The data connection works fine but I cannot receive or make any calls at all. This has been happening since past week. I switched Handset and the sim worked fine, calling worked, internet too. My phone worked fine before that and now its just data working. My APN is the same as it was before. My phone also supports voLTE but that doesn't work either.
should I get a new sim?