Can I undo an S-Corp to C-Corp conversion?

So I filed a form to convert my S-Corp to C-corp back in Mar of 2025 due to bad advice.

I called in July 2025 and the IRS rep said that they never received my revocation letter and nothing was ever processed.

Called again in December 2025 and the IRS rep said I was still S-Corp status and they never received my revocation letter at all.

I told the rep that this was a relief because I actually wanted to stay on S-Corp and that my intention to switch to C-Corp was a complete mistake. I had her put a note on my file for the record in case.

Fast forward to Mar 19th, 2026 – i get a letter from the IRS (Notice CP262) stating that my S-Corp has been converted. That letter was written on Mar 16th, 2026 – literally the exact due date of S/C-Corp tax return filings…

So not only did I not want to be an S-Corp, but I was mis-informed in December, thinking my company was still an S-Corp and so I filed an 1120-S through my CPA.

My CPA had errors when trying to e-file it (since my company is now an C-Corp), so I instead mailed my 1120-S to the IRS and also attached an explanation of the entire situation and miscommunication.

Additionally, I also sent a letter in December 2025 asking to rescind my initial revocation letter as a precaution.

I mean, genuinely this was a complete mistake trying to switch my company to a C-Corp and I practically operating as an S-Corp for the entire year of 2025… I'm literally the sole owner and the only employee. No other shareholders.

Given all of these events, is there any chance/hope that I could qualify for a relief on this?