First question - is ivylad your spouse or kid?
No legal advice here, but there is no way the entire funds went to the atty. SS disab atty fees are (generally) capped at 25% of back bens or $6k - whichever is less. So 75% would have gone to your spouse (or any rep payee), with 25% withheld for potential atty fees.
Feel free to feel critical of SS - they may well have messed up your case. They do mess up a relatively small percentage of the 10s of millions of claims they handle and payments they make every month. And their notices are not a model of clarity. BUT - IME of doing SS disab for 30+ years, in the overwhelming majority of cases (damned near 100%), they EVENTUALLY get it right. Likely slim reassurance for the uncertainty as a claim/dispute pends.
Are you saying you owe $11k in taxes on $50k back benefits? That really seems odd to me. I really no nothing about tax liability on SS disability benefits. In my ignorance, I had assumed they were not subject to fed taxes. Also, $50k is a MONSTROUSLY HUGE amount of back benefits. Is there any possibility that you might have misunderstood some aspect of the notices?
If spouse got a $50k payment, absent some reason I can’t imagine, he should have gotten a check for $44k, w/ $6k withheld for fees. If that is not what happened, either the notice/decision is incorrect, or you are misreading it.
Point of clarification - IMO you wouldn’t be hiring an “SSA attorney”, as an SSA attorney" would be an employee of SSA. I would consider your rep a “disability attorney” or somesuch." May seem minor, but may avoid confusion.
I’m curious, what does your disability atty say about all of this? If you fear he/she did something untoward, why isn’t your ire directed at them at least as much as at SSA? Attys who represent disability claimants ought to be experts at the very type of question you have. (Of course, some are worthless bottomfeeders IMO/E.) If your spouse was successful, they likely did SOMETHING right - and have already been well compensated, and should be happy to answer your questions as within the scope of their representation. If they aren’t why not contact the bar association? Of have your congresscritter look into THEM?
By all means, have your congresscritter send in a form letter to SSA. That gets a certain flag attached to your claim. It likely has SOME MILD effect in SLIGHTLY reducing the time periods, but to tell the truth, as a general matter I don’t even pay attention whether there is a Congressional inquiry attached to a file or not.
I’d imagine your tax advisor would be the best person to advise you as to how to handle this apparent dispute on your pending tax filing. I’m not sure what else an attorney might do. Possibly, a tax atty might know how best to deal w/ the IRS concerning any potential discrepancy. As for the rest of it, simply persist, be polite, keep all documents, and eventually you should get an explanation from either the atty who represented your spouse or SSA.