Airtel — unlimited pack sms issue

I did the recharge of amount 449, which is said to be unlimited pack and it says 100 messages per day, but i am not even able to send even 1 message, even when i try amount is reduced from the amount in the account. I tried contacting the customer care but i was not able to connect. The sim is actually registered from odisha and am currently in kerala so what should i do.