Turbotax prevented me from filing onone in 2019 so I send a hard copy to IRS. IRS, after 5 months, say they are processing and refuses to confirm receipt. What can I do

I sent my income tax form on July 15th, the extended deadline because turbo tax prevented me from filing online.  I need proof of income for 2019 and really need IRS to process or at least confirm receipt.  What can I do