How long before foreclosure

I originally bought my duplex from a person and had a "land deed". after a year they sold my mortgage to Mortgage Buyers in Ill. I have been behind in my payments, no more than 45 days at the latest. My most recent payment was due Oct 11th. I paid half 6 days ago and let the lender know I would make the remainder on the 6th. He told me that this would put me past the 30 day mark and they would have to start foreclosure. Is this possible or is he trying to scare me into paying quicker.