Bank Issues

[Ali Samana]

I have a house that I have as a sub2. Yesterday I found out that the bank raised the payment on the house from 759 (PITI) to 1014.89. When I called to inquire about it, the bank wasn't very helpful and I was being told that it has always been at the higher amount. When I started pointing out conversations (I take good notes) when I was told otherwise the lady got abrasive and refused to help me.

My question is, has this happened to anyone, what are some of the reason that a payment would increase by this much?

The taxes on the house are 1500/year and insurance is about 1300/year. The balance is about 50k on the note.