My cell number is lost to a third party I don't know

Authorised a third party to service my number without my concent now when I phone the third party to take my number back to vodacom they don't want they keep making me wait for 21days that doesn't get processed, I feel my right to a service provider of my choice have been infringed because when I visit vodacom for my number they say they have no any authority over it I feel betrayed