If you received a letter saying you have to pay back unemployment benefits received during the pandemic, don’t write a check just yet. Some people won’t have to pay it back. Workers who were not eligible for traditional unemployment benefits — mostly freelancers, independent contractors and the self-employed — were able to collect under several new federal pandemic programs. But as states implemented the programs, some of the rules changed midstream, and hundreds of thousands of workers were wrongly overpaid thousands of dollars in benefits by no fault of their own. In recent months, at least …