Bad customer service

We had a misunderstanding regarding the contract I had with them, and I stopped paying till I got a notification that I'm in arrears. In December 2023 on the 19th I paid the said amount of R641.63. February this year I went to Wonderpark branch for a settlement letter and was put through to head office, and was told with in a month I will get the letter till I'm still struggling to get it and looking bad on my score. That's why I ended up not paying cause this company wasn't giving a good service.