They'll try it on if you let em, I had issues years ago with paying a credit card, we came to an agreement to make payments etc, which we did, next thing we get a letter of demand for the full balance to be paid out within 30 days ($5k to be exact) I got back onto the Banking Ombudsman who helped us set up the payment scheme in the first place and next thing ya know the whole Debt was wiped!
stupid f***ing banks - they will try it on but I wasn't putting up the f***ing crap from them either! f*** em!!
Stand your ground fella's don't let pricks rob ya.