Idea Cellular — number is kept on hold by idea

I ported out from voda postpay to idea prepay. I cleared the last bill. After 2 months o[censored]sing Idea said I have dues to voda. If I don't clear, my no will be deactivated. I mailed voda, they sent me reference no. I paid the last due amount. Still Idea has kept my no on hold to make outgoing calls.