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OK, first please clarify: We can't collect both SS Disability and SS Retirement simultaneously. Generally, SSDIB goes to one's full retirement age, at which point in converts in name only, to SSR. So are you saying you were on SSDIB, are not over full retirement age, and continue to receive checks (which would now be SSR, it is a seamless transition and automatic).
And, you have a letter FROM the SSA that says you were "underpaid"? Does it prove direction? Does it indicate it will be remedying this?