Incorrect billing exhausting extended day to day benefit

I am battling with the medical aid scheme since October 2019 for incorrect billing, that should of been from my major medical benefit but billed from my EDB extended day to day benefit since October my EDB has been depleted coz of this error now I am forced to pay out of my own pocket until reimbursed don't know if correction will be in 2020 even then I predict a problem coz my new benefits will kick in and then be reimbursed but this is wrong I was suppose to carry over the surplus towards 2020 benefits. Does my 2019 benefit get swept under the rug? I have been liaising with a manager she has been updating me but the turn around time speaks for itself I am not satisfied and move for escalation. Kindly advise on corrective measure asap before 2020 please