Because you did not reply when the driver is already at your location, you should have not say yes if yoy are not at that time it was already past 9. You should have think anout the driver who a cepted the job. You wasted his time and effort, and you were not replying. I paid him small amount for the inconvenience and what abiut you, Next time always keep an aye to your cellphone because you have an ongoing transaction and you can not just say that you did not hear your phone and just ignore the