Careful of Medical Aid they might not be your friend

I left my previous employer for a new position with a new company. So I withdrew from discovery and rejoined with the new employer. When with with the previous company I contributed more then 6k PM on medical aid. And got a 16k savings account. As in have a family of 5 we used that within the first few months as I am also a diabetic. So for the last 2 months all expenses were out of pocket. Then I was told that I owe them more the R7000 now still because I withdrew and to make it even better because I dispute it I have been listed on ITC for a letter of demand. But I have never received a letter of demand from them. So how does that work? How do you list someone stating that you have given them a letter of demand and that have not seen it?