Airtel — outgoing calls not working while roaming

I have an airtel number [protected].
And for the last three to four weeks iam not able to make outgoing calls while roaming.
I did a check with the customer care, and they asked for my location, i informed it's coimbatore.
And when i said, it's not only for this region but for many, at that time he said there a are many areas like this in tamil nadu. He informed that there is a network issue going on tamil nadu for past few weeks and many customers has been complaining the same.
When i asked for the issue, they informed that it's due to the flood and hurricane happened in tamil nadu.
Iam not sure, why they answered like this.
It's really not acceptable, where iam not able to make outgoing calls, where the provider is not giving any update or answer.