Can the bank just switch the name on the loan without notification?

Seven years ago I was divorced. In the terms of the divorce, I

agreed to take over the mortgage payments- since I'm a stay-

at-home Mom we decided to keep the loan in his name. The

house transferred in my name. Now, the ex wanted to get a

loan and it seems he has too many outstanding loans. He went

to the bank and explained that I am paying for that one and

he may have mentioned that the house (which the loan is for

is in my name).

I paid my mortgage today and noticed that the name on

the receipt was no longer his, but mine. Can they do this?

His social security # is attached to the account as he

doesn't have mine, but now my name is on the account

and if there are any previous delinquencies, they go against

my credit. I knew nothing about it and have not spoken to

the bank yet as I wanted to gather my thoughts first.

How can a bank just transfer the mortgage from one name

to another without notifying the other party- without any

representation by the other party?