Very bad customer service

I installed Fibre with vodacom of which I was paying R299 per month that we agreed on. Later they changed the package without my consent making it R500 and something. I realized later, I think after 5 months that I'm on arrears when I called to find out why the router is off and that I want to pay. I had to take this matter to my lawyers to dispute that huge amount of money of the package I never agreed to continue with. On December the 19th the paid the amount I was supposed to pay with the Vvm of which vodacom already canceled my contract. Now I want to install a new fibre with a different company I'm failing to do so because vodacom is failing to send me proof of cancelation. Every time I call them they also tell they will assist me 4-5 working days but never assist me. They always refer me to different agents but never get help. So could you please kindly help me with this matter because it's been a while now I've been struggling with one thing.