Nice people who work at the agency, but my experie...

Nice people who work at the agency, but my experience has sucked. I signed with them August, 2016, now Jan. 2018, I have not got any work yet with them. I have applied to many casting emails they send me, but never get a job. On two occasions they've replied back asking if I'd be available a certain date on a casting I applied for. But when I respond my availability I never hear back.