Airtel — newly ported sim of airtel, no mobile network since 4 days

I recently ported from vodafone to airtel to avail a better pack (Big mistake!!). My sim got ported without notifying me on 26th jan 2018. I replaced the vodafone sim with the airtel sim immediately, as i was not receiving any network on my vodafone sim. But since then i have no mobile network on my phone. Absolutely pathetic customer service from airtel. I have called them multiple times and also written emails to them. No response from them. Still struggling.