Discovery pathetic service!

We have been with Disovery since 2012 and I am absolutely horrified with what I've been dealing with lately. My son was admitted to hospital on the 23rd of March. He fell extremely ill. Countless blood tests were done on him whilst he was admitted. My husband received all the claims emails. Discovery had paid for most claims BUT 2 of the claims for blood tests that were done whilst he was admitted were not paid for. Now, this is not my problem. My problem is that I have emailed about 4 or 5 times already to query why these were not paid for as these were done while he was still in hospital. The 1st time I emailed someone rep**** asking for details of which claims it was for. I sent them this information, and since then have not heard a word back. I have since then emailed 4 separate times following up and explaining myself over and over!! I made it very clear in my email that they contact me via email and not telephonic as I do not have time during the day to talk on my phone. It's absolutely pathetic that NOBODY has gotten back to me on my query. NOT A SINGLE EMAIL BACK! We have no had to pay PathCare out of our own pockets for the blood tests that were done while my son was IN hospital. Needless to say, we're looking for medical aid elsewhere! Pathetic. A simple response or explanation of why these were not covered is clearly too much work for them!!!