Very poor service

It is with great concern I write this, I had Capfin account which was handed over to DMC, around March last year I received a phone call from one of your agents informing me that I qualify for 35% discount to settle the account, immediatley after lock down I communicated with your agent via what'sapp confirming the settlement amount, agent confirmed the amount the it was paid on the 18-04-2020. On 20-04-2020 I requested for paid up letter agent that I spoke via what's app she told me that I can't obtain paid up letter cause the settlement amount that I paid was incorrect (which is quite strange because I obtain the settlement figure from them). I queried that with the agent she escalated the matter to her Team Leader, she advise her Team Leader is gonna get back to me with feedback regarding the matter, Team leader never did I pushed and pushed him through his staff, finally he responded via what'sapp on the 14-05-2020. He advise he apologise for the incorrect figure that I was given however to rectify this I have to pay the difference which I was R38.70 I paid R40.00 on the exact date. Few days after that he email me paid up letter. Surprisingly on the 26-01-2021 I received a call from DMC agent informing me that I owe them, I explained all of this to the agent Siphosethu, she said is going to escalate the matter to her Team Leader Rumana Obaray however nobody responded to me I phoned again spoke to Nqaba and Siphesihle both of them told me the same thing Team Leader is gonna get back to you and mind youI can't phone him(Team Leader). Eventually Siphosethu phoned me back and advise Rumana said because the amount was paid in 2 months discount became invalid and the paid up letter as well is invalid. My concern is why do I have to suffer for negligence of DMC agent who gave me incorrect figure????? Secondly after being told that amount was incorrected I requested to speak to a team leader but he responded to me after 4 weeks ( mind you I was chatting with these almost daily pleading clarity and speaking to Team leader, the response that I was getting was that the team leader will get back to you) that's also not my faulty, lastly after obtaining paid up letter why was I not told same time that my account is not paid why wait for 8 months to tell me that????????