Hold Up, This Was Your Idea!
The OP was hired as a data entry associate, which pretty much meant that they had to sit in front of a computer all day and input data or something. However, that didn’t stop their employer from giving them other jobs outside of their job description, like unloading tractor-trailers full of heavy aerospace parts.
After throwing out their back for doing a job they weren’t paid to do, the OP complained about not being able to complete their job. So, they received a few weeks off of work to recover, right? WRONG! They were fired on the spot because they couldn’t do their data entry tasks.