This is a Ticket To Work *Contractor*, a private company, so forget everything about working on Sundays and already having all your information.
I've gotten these calls before over the years I've been on SSI, and it's always the same or a very similar recording, with earnings/benefits numbers that make sense in the context of SSI (for me).
Googling the callback number they gave leads me to http://www.worksupportpayments.com/ TakeCharge.