Vodacom cancellations (NO SERVISE)

i am trying to contact vodacom without sucsess on the *** number and e-mail on ***.(doesnt want to renew my contract) the number they doesnt anwser,or putting the phone down after anwsering tried over 10/15 times The e-mail they provide doesnt work Delivery has failed to these recipients or groups: *** The email address you entered couldn't be found. Please check the recipient's email address and try to resend the message. If the problem continues, please contact your helpdesk.