Airtel — unable to send port message

Address:

Chennai, Tamil Nadu, 600056

Hi,
I'm trying to switch my airtel number to other network. But i received "message not sent". I tried in different handset to send the message but i'm getting same message. When i contact customer care they asked me enable premium messaging service, but no use because it was already enabled. I'm facing this issue in all 4 airtel numbers in home we use.

Please check this and help me

Thanks
Raja g