BAD SERVICE it is culture at vodacom

On Friday my cell was ******. When I call to claim they say the cell was already blacklisted in 2013. No one can give answer how the phone was used while blacklisted on a contract no. The same cell was replaced by vodacom insured. No one can help me. Insurance department send me to ITC listing department and vodacom can't assist. We have paying the insurance and the contact on that cell for over 2 years now they can't help me. Vodacom can't even give details of who blacklisted the cell. How do blacklisted cell work with contract number?