Unresolved Un-Blacklisting Request

I am having endless problems regarding my phone. I had lost my phone on the 8th March and requested blacklisting. On the same day i got the phone back and completed an un-blacklisting request. My phone never lost network since then until the 13th April when it lost all connection. When i went into a Vodashop in Fourways they advised that the phone was blacklisted that is why it displayed "No Service" Since then i have been calling Vodacom every day with no resolution or accountability trying to get the phone un-blacklisted. Each time i call, their records indicate that the phone has just be un-blacklisted on the same day of my call, 17th April, 20th April, 25th April and 26th April, this happens on each day that i call. Since the 17th April i have had no network connection and every time i call i speak to a different person who PROMISES to call me back with an update, but no one has EVER called me back. My frustration is that I have no reference or specific contact I can get for follow up and resolution. I cannot get contact details at all leaving to use the Red VIP contact and relate my story every day to a different person who also promises to call me back but doesn't. Every day since the 17th April I have been calling and speaking to different people. I cannot escalate this problem to anyone at Vodacom except to deal with the contact center people everyday. Can someone at Vodacom assist me please before i cancel this contract since i cannot use it.