It seems it is Nutrient Deficiency i.e seems to be Calcium Deficiency. If your soil Test shows the calcium in a Normal Range it might be Fungal infection of .Phytophthora Blight (Chilli Wilt). This may effect due to water Stagnation or over watering to the Plant with lesser Drainage facility.If you ore going for Chemical Farming Spray Copper Oxicloride/Dithene M-45 or any other Fungicide.If you are following Organic Prepare Mixture of 2 Parts Desi Cow dung
1 Part Desi Cow Urin 1 Part Neem Oil. Mix the ingredients thoroughly .After Filtering 2 Ml/Litre Spray om entire Plant.It is better you should have attached the IMAGE of entire Plant.
I didn’t knew that, adding calcium in any farm must be done only after proper soil test. You can use Ground Limestone, Gypsum, Fertilizer, Eggshells etc that are conventional ideas of adding calcium to farm soil.
As seen from the Images, the crop seems to be Very GOOD with Small Fruits. But could not Found Flowers.
Have you sprayed Growth Regulators as suggested. It seems to be needed in view of the crop is thick Green and
heavy Growth. On spraying Growth Regulators Flower and Fruits will be GOOD Ripening. Try NOW.