my device got blacklisted incorrectly

Vodacom blacklisted my blackberry device incorrectly. After numerous emails, phone calls, visits to the Vodashops and two months later all they say is that the phone is unblaclisted after I gave them proof of ownership. My device is still unusable and I get no answer or help or response on how to get it fixed. I asked via email that a manager must please contact me regarding this but still no manager has contacted me yet. I have proof of all emails sent and a few names of people whom I talked to on the phone. I even went to two different Vodashops but no one is able to assist in my problem. It is now a month that I have not heard a word from them.