Default against an existing Discovery Medical aid customer

I just found out that I have a default under name due to an amount of R340 that I have fully paid to Discovery. This default was listed while I was making monthly payments as the initial amount owed was R660. My medical aid was canceled a few months after I lost my job as I could not pay the outstanding amount due to unemployment. I got employed and contacted Discovery for monthly payment arrangement and also joined Discovery yet again with my current employer.

What disturbs is that a premium of more than 5000 is taken via the employer yet your a default was given for a previous account that I was paying every single month. Your processes are flawed if you disregard customers like that.

Please do not call me, I am not interested - just send me a letter confirming that the Default has been removed.