I have extreme breathing hardships, a harmed foot and a few harmed ribs.

I work for Walmart in Cadillac, Michigan. I have extreme breathing hardships, a harmed foot and a few harmed ribs. At the point when I met and was extended to the employment opportunity as a client have/greeter, I clarified that I had restrictions, for example, requiring a seat and to have the option to utilize the mechanized trucks when accessible and provided that I expected to travel a significant distance in the store. I was employed being told this sounds permitted at least in theory. Presently they are denying me a seat and the utilization of the trucks, compromising "position reassignment" and the HR director has effectively said there are no positions accessible.
I don't, for this work, need to run, stock, or do anything separated from welcome clients and really look at receipts. All of this should be possible with a seat and would not affect the work.
Do I have a possible case?