Western Bank

So yesterday I get a call from Western Bank, whom I used to bank with until yesterday.. I co- signed on a loan for my son, he lost his job, hasn't been able to find anything stable in months, he had another personal loan that he took out prior to this loan, he took this out on his own.. On the loan I co-signed for I have been paying..faithfully.. So Leslie at Western bank has decided to piggy back the loan that my son took out on his own, ( me not having anything to do with this personal loan whatsoever) I have not signed or have anything to do with this... To me, I don't see how this financial institution feels that they can do this legally.. I'm disgusted that they feel so freely to burden me with a loan I have nothing to do with! I'm in contact with the BBB and the Attorney General.. I'm in shock that they think I'm responsible for this personal loan I am not on or have signed for!!! I just thought people needed to know what kind of shady bank this is!!