I had a good experience with vodafone, they actually follow me on twitter, they have saved my twitter username with mobile number somewhere. Whenever I tweet to them, within minutes I get a call from them without even mentioning details. The person who is talking to me will keep tracking my complaint and will call me after 5-6 days just to make sure the problem has been resolved. When I was on roaming in Tamilnadu, there was no data signal, they immediately added 25 GB to my account as compensation. Their Live chat service in app is excellent as well, real people reply there unlike airtel bots.
