Being sued for failure to leave foreclosed house but we signed a cash for keys agreement that gives us 60 days

Our home was foreclosed. We received a letter saying we had 3 days to move. Within 24 hours we got another form saying they would pay us 2,000 dollars and give us 60 days to leave if we agreed to hand over the keys and leave the house in broom swept comdition. We agreed and signed paperowrk that was fedexed to us and returned it. We still have 30 of those days left before we have an appointment with a wells Fargo rep to hand over the keys. Today I was served with law suit papers saying I have to be in court MONDAY for an eviction hearing because we have not vacated yet. It seems the foreclosure attorney who filed the suit paperwork and the bank who had us sign forms are not in contact about this. Do I simply go in on Monday and explain what has happened? In the court papers it mentioned us having to pay for the court fees.. there should never have been any so I need to get out of that as well. Thanks for your time and expertise!