3Pl lost inventory for 3 months and no resolution

I have been storing my inventory with this warehouse Seller Shipping Solutions LLC in Topeka, KS. When I wanted to ship in September, they told me they don’t have all of it. For now, there are 2358 units, valued at more than $50,000. After they went silent and unresponsive for weeks, now they are playing a game we are investigating. And this has been going on for 3 months. Half of that inventory sells only during this holiday season. So we missed on, in addition to no reimbursement. Has anyone faced something like that?