Vodafone — Number ownership changed without my consent and presence or any id

Address:	New delhi
Website:	Vodafone

My number [protected] is used by someone known to me..back in may my ownership changed without my presence, consent, sign and id.. for this I complaint to vodafone idea customer care but they replied that another person only needed sim with them and otp is required with same sim and ownership is changed to new one but how can this happen because in todays time many bank accounts and adhaaar pan car also other documents Linked to them..so why this practice has done by vi which is wrong