A default listed on my credit profile

Expressing my utmost dissatisfaction with a service received from MICSA of Languages, last year March/April I had enrolled for online Portuguese classes in which the classes commenced around April however I was not satisfied with the manner in which the sessions were offered as my learning expectations were not met-Firstly I intended to partake in Brazilian Portuguese and also the sessions were not offered to cater for beginners and it was very fast paced. I had then dropped after attending 2-3 sessions and had also informed the institution that the course had not met my expectations however MICASA had decided to hand me over to its lawyers of which a default was listed against my profile which negatively affected my career- There was never an instance where I have not responded to MICASA or its lawyers emails or calls explaining the reason for dropping out and subsequently not paying. I had also contacted the institution to enquire regarding the default and had received a response from Craig Van Der Merwe that I need to contact its lawyers Duvesco which I did several times and I was advised by Cherilene from Duvesco that the instruction to list the default on my credit profile was received from MICASA which I did contact MICASA and liaised with Craig Van Der Merwe on numerous emails (This can be shared on request) he informed me that the listing will not be removed until I settle the balance and my question was how do I pay for a service which I have not benefitted from? Secondly, I had requested Craig to look at the number of students who have dropped out from the very same class, this alone should give a clear indication of the type of service rendered by MICASA- I had also referred my colleague who had paid the full course amount and he also dropped out for the same reasons and he did also confirm that a number of students had also dropped out. I had then proposed to Craig that it will only be fair if I pay for the 2-3 sessions which I had attended and he refused demanding that I pay the full course amount-Craig Van Der Merwe had also passed threats that the institution will sue me should I air my dissatisfaction on public platforms in which my response to him was that it is within my constitutional right to ventilate a bad service should I not receive a constructive feedback from the service provider of which I had tried several times as per the email trails of which there was still no positive outcome instead I kept on being referred to engage the lawyers in which the lawyers were also not able to support understandably they acted based on the instruction received from MICSA. I am hoping this review will be seen by the Directorship of MICASA and wiling to engage with them further and furnish any correspondences which they may require to resolve this long standing matter. I had sadly lost a great employment opportunity due to such!