Who called from 21476425

Don't answer calls from numbers I don't know, which is the case with this one, but 8 digits is strange!  3 calls today alone

Lower my credit card interest rate. I pay my credit cards off every month.

Very odd number.  No message left either.

They say it's a credit card company, my credit card company in fact, but they didn't have my information. He asked me for my card expiration date and that's when I said, "No, please take me off your call list." The guy cursed me a few times and then hung up. I think it was probably a scam.

I answered but hung up when no one spoke. I assume it was a telemarketing call.