Engine damage V50 1.6D

Hello, we have an engine damage on our V50. Year of construction 2007, bought last March. The soot particle filter would be clogged and therefore our used car warranty will pay nothing. When we bought the car he had 120,000 and a new soot particle filter in it (which was probably already clogged before). We drove with it 30,000 km and often long distances, therefore we think that we did not have the part clogged by wrong driving method. In the meantime already the turbocharger and the light engine was broken (only trouble with the car!) In theory then something else would have led to excessive sooting then, if the thing is so fast again, or? Do you have there perhaps some clues what could be responsible for it? Oh, yes: it was not indicated to us that the part is clogged. The car has jerked well, my friend has driven next to it and has called the ADAC and there was already too late… Differential pressurer broken? When the previous owner had the clogged soot particle filter was probably at that time, but at least did not return to an error message.