BMO Harris Mortgage Complaint

BMO Harris Mortgage department,

Home equity loan or line of credit Settlement process and costs Indiana

my home equity loan with m & i bank in - wi. was bought by bmo bank after about 5 years, after paying on it another 5 years never missing a payment and always on time. they told me it had come due and they would not renew it. there was no due date on my contract with m & i. i have a - credit score. and have never been late on payments or filed bankruptcy. bmo advertises, were here to help. not in my case.they want to go in default with it. i dont know what i can do. please help