Airtel — 9746.... not accessible from roaming airtel number itself

I am a user of airtel ( kochi, prepaid) and presently on roming since seven weeks, and unable to contact airtel numbers at kochi which beigins with 9746... rest all numbers of various service providers are accessable. I have launching complaints every day by phone/email but still got no result. (two more airtel users from kerala are facing same problem.