One of the main reasons why new services like ZeptoExpress comes to light and are created.
I remember listening to a radio interview how CEO and founder of ZeptoExpress was so disappointed with "fast" delivery courier services like GDEX that he started a whole new company just to address the shortcomings he saw from that niche industry. Now that ZeptoExpress and many other similiar services have taken off I see now that it was a sensible if not ingenious decision.
Sort of like the Taxis vs Uber. One of these days GDEX will go the way of the dinosaurs if they don't improve their service. (Yes I think they might still have a chance, albeit slim). Otherwise they will be replaced with newer, better and faster services.