[US] Dialed the wrong prefix (888 instead of 800) and pretty sure I got scammed. 😩

I have been fighting with a merchant about a charge and called a number this morning from capital one to discuss my dispute. I dialed 888 instead of 800 (the last seven numbers were correct.) they asked for all of my credit card information about the card in question. Then they asked for all of my checking account information which I questioned multiple times why they needed it, but they said it was to validate I was who I said I was. I reluctantly gave it to them.

I kept asking when are you going to help me with my actual dispute and the guy (who had a strong Indian accent, but whose name was James Miller) said he would at the end after he verified me. At the end of the call he told me to hang up and call a different number.

I immediately put my credit card on a freeze, but I cannot get a hold of my bank. It’s Sunday morning. There is no email address or 24/7 support or way to freeze my account in the app.

I am certain now that this was fraudulent. I called the capital one number with the correct prefix of 800 and it’s a completely different phone introduction and message.

I am sick to my stomach. I have googled ways to get in touch with the bank but there are none. All numbers lead to their 24/7 phone line that just does simple tasks or where you can freeze a credit card. No fraud for my checking account option.

Would love to know if anyone has any ideas. Or if someone can provide me reassurance that anyone with my information can’t effectively do anything with my money until close of business Monday when the bank opens. 😩😩😩😩