Road accident met with minor injury/scratches on the person

Yesterday when I was driving, due to intervention of a motor cycle while turning the road, I had to take a long turn. Eventually, a old man without even having a watch on the road came in between, and foreseeing that we stopped the car. But the old man became nervous and he has to drop his belongings and fall down. Seeing this we got down the car and took him up from the ground & asked him, if everything ok and insisted him for first aid. But he denied. After a while, the area people gathered there and started taking snaps of the vehicle number plate & a policeman who came from nowhere started yelling by saying we dashed him who was standing in the pedestrian area and reported the same to traffic police. He threatened of filing a case, took mine and my brother's phone & address. He tore the first sheet gave it to one of the people in the area, for any further correspondings. Then, on a humanitarian grounds, we took the old man to hospital for first aid and in the end, doctor confirmed there is no fracture and it's a minor scratch that resulted in bleeding, and nothing to worry. Also, we enquired doctor that, he has diabetics and will this have any problem. Doctor clearly said, we have give TT injection so we don't have to worry about any septic or healing of this sore. Also suggested that, even if the dressing is removed off, it is good to keep it air open. Nothing to worry. Now came the problem, the people who have gathered started demanding some share. Because the traffic police who came there again noted down our name and address, and then slightly threatened by saying, if I file the case your car will be seized and a FAIR will be filed. Better you both parties sort down instead, and he left the scene, without any further thoughts. Again the people started demanding some money, we told it's a minor accident and doctor has promised that he will recover in a day of two. Then, we told first lemme take him back home and leave him there & speak with the people there. We headed to the old man's home and then people have induced something to the old man's wife, she started telling good old stories and started demanding some money. We said, we can give a least of 1000/- to 1500/- as it might take two or three days to recover and this money would help him to buy fruits and help him for next three or four days. If he doesn't recover in the three day slot, please call us, we will take him for further treatment. But those people never agreed and they were greedy about money and asking again somewhere between [deleted]. Now, after enquiring with my uncle, who is a retired SI, told, don't spare a single pause. What if the assurance that they don't pester you tomorrow over call for some more. Just leave from there saying to file a case for further, as you have done your best. So I did leave place and those guys threatened we will file a case. And we told yes, we can see it legally. Please suggest on how to handle this further. Thanks.