Bad service delviery

I have been ordering using the sixty60 app for a while and i enjoy it, but i have to log this as an annoyance and this has not happened once but numerous times. I order and would include a code to the security gate at my complex. A few times the system issuing codes failed and what i would then do is place a note for the driver on the app to advise security the delivery is for my unit. The driver would arrive, not be able to get in, does not read the instruction on app and then leaves, this then cancels my order, i get refunded the money partially as checkers retains the delivery cost to themselves. This is not my fault the driver does not read the instruction. This is really annoying.