Don't honour arrangements

I was in arrears with my bond payment busy sorting out my property. I am in the Process of moving my account over to FNB because my wife is employed with FNB and its an extra 2% saving on my bond. For the ten years I have been with Nedbank, not once did I default on my bond. I phoned nedbank to make arrangements, and that lady was helpful and I paid the amount they said i needed to pay, Someone called me to restructure my bond, and i explained to them that FNB is almost done with all paper work, and will settle them, in the meanwhile i will pay the amount that what we agreed to, he told me all is good, the next minute im handed over to the attorneys and are receiving nasty letters of demands, after I was told the arrears should be paid up withing six months what kind of arrangements is this that youll cant stick to it. Very Disgusted and dissapointed