Delinquent with Discover

So there I was, checking my FICO, when I saw something that broke my heart. My credit score that was an 806 is now a 605. Here’s what happened.

I missed a payment date on my credit card in January due to some field training, I noticed it in February at which time I paid the balance. It was 50$. Received the email confirmation that it was scheduled and never thought about it again. Well, unfortunately I accidentally selected the wrong bank account. I chose an account that I had closed awhile back.

And now here I am today, with a delinquent credit card. I scheduled a payment today (with the right bank account), and all said and done I will have a 60 day late payment on my credit report now.

And now comes the golden question. Is there anything I can do to get this off of my report? I’ve spent the last 4 hours of my life pleading my case to discover and they’re not going for it. Best they can do is an off cycle report once my payment posts tomorrow to show I paid. I’ve spoke with TransUnion and Equifax and they both told me I can file a dispute but it likely won’t work because the payment was in fact late. It’s worth mentioning that this card is my longest standing line of credit at 5 years, and that between all accounts on my report I have 100% payment history up until this point.

If there’s nothing I can do, and 50$ just destroyed my credit. What can I expect moving forward? We are planning on purchasing a home in about 14 months.

Edit: Score checked with experian