Ford wrongly refuels help!!!!!

Hello first of all! I have the following problem: I refuelled a Ford transit in mental surroundings instead of diesel with petrol. The following has happened: There were still about 10 L diesel in the tank, then poured about 40 L gasoline over it (so ́n crap). The car moved only 10 meters from the pump and then towed. The tank was emptied according to information completely all lines. Then filled again with diesel. After that still about 300 km until the car started to smoke. If you do not know what to do, you will be able to do it. If you do not know what to do, you will be able to do it. If you do not know what to do, you will be able to do it. If you do not know what to do, you will be able to do it. If you do not know what to do, you will be able to do it. If you do not know how to do it. If you do not know how to do it, you will be able to do it. I am grateful for any advice. Greetings Hoschi !