Double Deduction

I just experienced a terrible thing. Discovery flexicare just made a double deduction on my account . They inform that I should go to my bank and I tell them about it which I did but the with FNB there is a fee to it because it's a reversal so I asked the the lady who is responsible for this now she just said that I must contact Discovery flexicare. Discovery flexicare told me that I would wait 3 to 5 business once I send them the bankstatement. So how can you do business like this but once you are one payment behind they want to terminate you policy but now that they do this you just have to accept it. BUT I REFUSE TO ACCEPT IT BECUASE SOMEONE NEEDS TO BE HELD ACCOUNTABLE.

PLEASE THIS NEEDS TO BE FIX BECAUSE WHAT ABIUT THE MONTHS THAT STILL NEEDS COME???