Total incompetence, or they just don't care

Discovery Health refuses to deduct claims of my mothers self payment gap. After sending in a claim from my mothers dentist with proof that it was payed for in cash Discovery Health refuses to deduct it from my mothers self payment gap. I am really sick and tired of the incompetence, and bad service from Discovery health. *** ref number of claim. Please do your jobs. R11500 per month for no service