I applied for the job in this company in which the...

I applied for the job in this company in which their demand was of full time employee. I went for 1 written test, 2 interviews on different days, one day of online training and one day of in class training. I was hired after this long process just for random shifts and random sites (No full time job though it was their demand in job posting). Even after accepting this, I didn't get 1 shift within first 15 days. I resigned there after as I got other job.