Vodacom ruins lives

I can't leave a 0 star review for this garbage fire of a company unfortunately. Took out a Sim contract through mondo mobile and 2 Sims were delivered- 1 for airtime and 1 for data, my phone only had 1 Sim port so why I got sent 2 Sim cards is beyond me. I canceled within 2 days of requesting the contract (billing was to be done after 7 days). I get told the cancelation was successful but apparently not as I was blacklisted by vodacom for an amount owing and only found out after I was contacted by a debt collector. I got a formal apology from vodacom accounts 12 months ago and a letter from trans union stating the blacklisting would be removed as there was no sufficient evidence to support it yet today, a full year after the letter,the blacklisting is still on my credit score. Thanks for ruining lives vodacom.