Devastated after 18 years of Loyalty

Ii have been a loyal member of Premier Private Resorts for close to 20 years. I queried why they record the levy as a loan on Experion which shows as me exceeding my credit utilisation when paying your levy monthly. This compromised my credit score for 9 of the 12 months. I tried relentlessly to sort this out with their call centre agents and their finance department but my explanations meant nothing but promises even after sharing pictures on their whatsapp. It seem like the departments work in silos and don't have any clue of what is going on. I cancelled my my debt order and resorted to eft. I got the statement and settled. On checking my credit health on Clearscore, they marked the payment as missed and cost me 15 points. This was the first missed recording in over 40 years of working. I wrote letters, spoke to several agents, whatsapp with Proof of payment but nothing. Again in May and July I paid by eft but they reported missed payments. I finally got so tired of promises and cancelled my contract. I was asked to settle the outstanding levy by 31 July and only then will they mark my contract as cancelled. I did that and got charged an admin fee of R400. On the next debit date, they collected my monthly levy again. I wrote to them and a while later got a response that their senior management wanted to talk to me again. All I want is to get my money back less whatever charges and terminate this contract please. I am scared to reverse the debit and get another mark again my credit record. I have to wait for 3 to 5 years for my records to clear. What do I do.