Airtel — 349 plan complaint

I used most of the network and i think airtel is most fraud for cheating people. My intention is not blaming but i faced such things.
I recharged 349 unlimited pack in airtel application. After that its not working now because i am in roaming. The plan didn't specify such details when i recharged, only give the details o[censored]nlimited plan.
After that i called to costumer care but they don't take any responsibility and said that all network have that same policy that plan not working at roaming (But its wrong because other network like jio plan working well). So my rs 349 was wasted. So i thing airtel network is the fraudest network above all networks.