Stuck in Appeal Hell

How do I get SSA to admit that after a year the y are no closer to giving me an answer to “why am I being charged for an overpayment?” I have asked for a decision to my appeal 2 x, but have not gotten one.  I have a lot of accrual of payments and mistakes and they keep “hedging.” I have also been put on a “repayment plan.”  Of course I only committed to the minimum allowed ($25./mo) this amount will be ongoing because I am 72 and will be deceased before the payoff!!  PLEASE  GO AFTER THEM.