Help needed Wells Fargo

I had signed up with a debt settlement company for around 5 months. They never paid anyone and I canceled their service.  I contacted all of my creditors and made arrangements to catch up with the payments with all  of them ( They are all up to date except one Capital One and they are working with me.  I tried to talk to Wells Fargo explained what happened but they said there was nothing they could due unless I paid the full overdue balance which I could not.

So about 4 months ago I was served papers from a attorney representing Wells Fargo I called the lawfirm and we came to an agreement that I would pay $100.00 for six months ( I have made 4 payments of $100.00 last one on Jan 2,2013 ) and then $200.00 monthly until I am paid in full. I have papaerwork stating the agreement from the lawfirm.  Everything was going OK until last night when I was served again by the same lawfirm. I am suppose to appear in court in February. The summons is saying that I have defaulted and have not made any payments.

I do not know what to do. Should I call the lawfirm and ask them what is going on?  I really dont want to have to go to court but I do not have the full amount to pay the bill in full.  Please give me some advice.  Thank you.