Idea Cellular — my sim does not taking network.

My idea Sim showing emergency calls only since two days... I turned of my phone.. Make it flight mode, restarted, i changed the slim slot, i put in other phone also.. still no benefit.. What should I do..ur network is poor any way.. I m gonna change my sim i[censored] guys don't take any action with in 24 hrs... How much i faced trouble bcz of this uk.