Discovery/Stratum mess and I'm out of pocket

In March I submitted a claim which Discovery only paid a portion of. There was a R6500-00 portion that I had to pay. But, Discovery issued a statement that they had paid in full. So, my GAP cover (Stratum) cant follow the email trail with Discovery apologizing for the error and I am 6500-00 out of pocket. Both of these organizations are very *********** and I can only hope that the NHI will become a reality. Whatever the problems that come with it, will still be better than the nonsense from these big corporations.