Depleted my Savings Account with an incorrect deduction

This is unfortunately my third Hellopeter complaint about this matter and it is getting worse because discovery health now depleted my medical savings account. Here is the story again. I paid a service provider then claimed it back from Discovery, they paid me AND the service provider i.e. service provide paid twice. Then discovery asked that I (not the service provider) pay them back. I complained and the discovery said the issue is sorted with the service provider. They even send me correspondence from the service provider. They deducted the amount again from my savings account on 18 May 2021 and it depleted it. Now, I cannot do any out-of-hospital claims because of that. The mistakes of the Medical Aid is now impacting the health of their member. How can they justify that?