Who are "they"? If  you look at the pdf copy (you should always keep a pdf copy), what year is on that tax form? 

If your perception is correct, you will need to file an original 2018 (you should be able to do that with PTO).

You will also need to file an amended 2019 tax return, which will have to be a paper tax return. https://proconnect.intuit.com/community/help-articles/help/how-to-amend-an-individual-return-1040x-o...

Like old age, preparing taxes is not for the faint of heart!