Airtel — why digital sim swap not available in my mitra app?

Address: Hanspukuria, nadia

Dear sir, sim swap option in airtel mitra app is not showing, i tried with uninstall & again new version install but still not the option is showing. Everyday my customers returned from my shop, they came for sim replacement, but i can't help them. I also contacted airtel customer care but they not helped me. My lapu no. [protected]. Please help me. I need sim swap option very urgent.