Ahhh missed payment! But not really!!

So over the summer I took out a loan to finance a home construction project. The construction company had me work with their bank, a small local bank. The deal was 0% interest for 12 months. After the 12 months I’d have to pay 16.99% on everything, or if I had a late payment I would have to pay the same interest. That’s fine, I can certainly pay it off in time. (My loan was for $12,500, so 17% interest is about $2100)

Welp, my due date is today, I go to log in to make the payment and it says the payment is already delinquent because today is a holiday and the earliest I can schedule it for tomorrow. WtF?!

I’m freaking out cause I seriously hate wasting money!! I plan on calling as soon as they open tomorrow as soon as they open.

Any advice? Do you think they will make an exception?! Ugh I hate banks!!