Vodafone India — vodafone does not granting me permission to mnp my no. to any other service provider

Address:	Lucknow, Uttar Pradesh, 226014
Website:	na

I am using my mb. No. ([protected]) since 9 years last 2 years before i ported my no.in vodafone and till i am on thier network but now i want to port my no. To any other network but i am unable to do it in last six months everytime when i send msg for port code. I
They reply me that this no. Is allocated for internal purposes.
As for your information this no. 1st time i bought from idea store in 2009 then i use it 4 years then port it to in aircel and thereafter 1 year i port it to in vodafone.
But now i am unable to port because of vodafone.
I want to resolve this for that i have called on thier customer care but they said contact headoffice when i came to their headoffice they tell me same that i have mentioned above that this no. Is allocated for internal purposes.
Please help me to fight with this problem..