I interned for a company called XXX or XXX (End to End Marketing Platform). It takes a large number of work-from-home interns from IITs and other top colleges, assigning them tasks in various domains. In the middle of the internship, after completing some work, they claim your performance is poor and release you without any pay. I completed the work assigned to me, but the CEO, YYY, gave me additional tasks that I couldn't complete in time. He released me, stating that I didn't complete the extra work, which wasn't mentioned in the job description. To this day, I haven't received any payment or certificate. I don't know what to do! I haven't met any of them, but I signed an NDA and offer letters. Can you help me with this?
[Edited: please focus on the problem instead of naming companies or individuals]
[Edited: please focus on the problem instead of naming companies or individuals]