Sound very strange that no one has been able to figure this out... Please indicate what the car does when you try to start it. Does it crank but not start? Does it just click or is it silent? Do the accessories work? What does it do different when you jump it? If someone replaced the starter, then it must not have been cranking. (?) The other place put in 4 different batteries, so they must have thought the battery wasn't providing any power. (Cables maybe?) Is this an ATX or MTX? Sorry for all the questions, but we really need more info to help you out here...
