This is clearly damage from Brinjal fruit and shoot borer Leucinodes orbonalis.
The difficulty with controlling borers is that any pesticides sprayed do not get in contact with the pest. The pesticides you are using are good but will need sprayed continually to repel the adults from laying eggs on the plants and killing the just hatched larvae that are exposed. Neem is generally said to be good against borers.
On an integrated basis, collecting and destroying the affected plant parts so that there is no reinfection is important. Some biopesticides such as Beauvaeria bassiana and Bacillus thurungiensis kurstaki may help when repeated periodically.