Tenant hasn't paid rent. I tried reaching out to them, but they seem unresponsive. They told me they'd pay it a week late, and I still haven't received the payment. I tried reaching out to them again, and they haven't responded...

When January 1st comes, I still can't charge any late fees for late rent for this month and December, right? So, essentially if the tenant is paying $1000 a month, then I'd post a notice saying they need to pay $2000 for November and December within 72 hours, is this right? And if they don't pay, then eviction? 

Any other options?