Discovery medical health

My experience with discovery medical has been very difficult. I was told that my premium was not paid by my employer so I paid manually and settled the account.Discovery than sent me an sms confirming the funds. On the 1st of August I was billed R6860 for no reason and only when I called that's when I was told that I was billed twice by mistake. I have to use the money to pay for my car and other bills. Discovery has no remorse. Every time I call I'm being sent from pillar to post and end up holding for a long time and I still don't get help because I get told that I will get my money after 5working days ONLY IF IT REFLECTS ON THEIR SIDE I'm being told that I should again follow up with emails