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The high engine oil level on the engine dipstick needs to be sorted. A high oil level on a diesel can cause the engine to run away and not stop when switched off since the engine can run on the oil as a fuel. There have been a number of cases reported recently in the Car Mechanics magazine, some of which have resulted in engine damage if not stopped by such as stalling it on the clutch. Maybe if there was some dirt inside the fuel tank and if the additives have dislodged it, then it could have blocked the diesel filter at the engine end but I would expect if this was the case it would take some time to happen. There was a report once of a van that had water in the diesel that formed a jelly that blocked the filter and this is apparently common on boats. Most likely cause of the poor performance that I would look for would be a sensor or pipe disconnected as part of the service near one of the filters that has not been reconnected or maybe an air leak around the air filter. I think though you should go back to the people who serviced your car.

You need to check under the bonnet,it sounds as if they have disconnected the MAP or MAF sensors to do the service and have not connected them back up again. Had this on a 406 and it made the car quite sluggish. The MAF is on the air intake, I don't know where the MAP is. MAF=Mass Air Flow MAP=Manifold absolute pressure. MAF tells the ECU how much air is going into the engine, and MAP tells the ECU how much turbo boost there is. Coastline will be along soon with the correct answer.

Not really enough information but if the oil level on the dip stick is right then its not that. The DPF would show warning lights so I dont think it is that either. If you changed the fuel filter have you made sure the hand pump is hard and enough fuel is being delivered. An air lock would cause the symptoms you have. Failing that look around the engine bay, have they disturbed anything?