Vodafone — regarding my incoming call problem outside chennai network

hi,

i have vodafone number [protected](chennai circle) . I am not able to recieve any calls on this number in any of the roaming circles (outside chennai) and the call gets disconnected in a second and due to my business i am not able to change my number.So on all the incoming calls i have to call back with roaming charges applicable.

i have registered 5 complaints with vodafone from last 1 year on there customer care but all the time i got the reply that the problem is resolved but every time it was a mock message and even i have send them personal mails on the mail id which they have provided for customer complains(vodafonecare.[protected]@vodafone.com) ,but their reply was just a formality to put the matter in cold bag.