The story of Shawn Hill's battle for his Tampa house starts with a knock on the door.   "He said, 'I'm here to serve you a notice of foreclosure,'" Hill recounted.   Hill remembers that day in 2008 like it was yesterday.   "You know, you have the wind knocked out of you," he said.  Fortunately, Hill was able to negotiate with his bank. He says they canceled the sale and approved loan modification.  Then, eleven days ago, he answered another knock at the door.   "He says, I'm an investor and I wanted to take a look at the property. The property is up for foreclosure this morning at the Hillsborough County Courthouse,'"Hill explained.  Hill thought he and his bank had reached an agreement. He says he was making payments and believed he was on track to save his home