Vodafone India — deactivation request for my number [protected]

Address:

New Delhi, Delhi, 110019

On 16th i requested to deactivate my number [protected] which customer care are not taking my request... I called up 20 times but they disconnect my call every time... They say i should convert rather convert to prepaid

Am already using 2 numbers [protected] and recently bought this new [protected] as i liked the number... So why am i being compelled to use 3rd number which i wanna deactivate.. Will vodafone will provide me free handset for the same...
Please do the needful or else am not gonna pay the bill of the said number...

Thanks