Okay, why do I feel we are missing some pretty large holes here?
Why would you have an agreement with Wells not to take on any additional debt? Did they forgive interest? Modify your Note? Consumer counseling? There are no provisions that can extend beyond signing of the Note, unless there is something of an unusual nature going on. Are you certain you understood them correctly?
There could be an innocent reason for the call. Example: I pay my mortgage via my bank's bill payer website. Only one month, my payment changed and I didn't open the statement and my payment was less than the required amount.
Lucky fo me they called before I was 30 days late. And what do I do for a living?