Failing to honour Customer loyalty

I have previously complained about the bad service I have received from Vodacom Retention department. My contract was due for upgrade and following several bad experience I was pushed to cancel. Vodacom cannot provide me with the handset deal I want and reason is my score has been lowered because credit bureau showed a default that was settled but not removed because the supplier failed to send the request. I offered Vodacom the proof from the creditor that the matter has been settled ages ago but Vodacom cannot seem to assist me to rectify the score. My bill usage is more than the subscription plus device cost, and my previous complaint shows resolved but there was no contact from me which means the handler chose to close the complaint without speaking to me. I work from 1pm to ten pm and Vodacom incessantly calls during my work hours which prejudices my ability to establish contact. I have been a loyal client for over 12 years, I do not deserve to be treated in this manner. I have always paid my bill on time so why am I receiving such bad service from Vodacom? I am being left with no alternative but to cancel if you cannot treat me fairly. I am unavailable from 1-10pm