Poor time coordination. Our shop is opened from 8....

Poor time coordination. Our shop is opened from 8.30am to 12.15pm, 2pm to 5.15pm and 7pm to 9.45pm. But the delivery guys always want us to open longer to suit their time. Otherwise, the reply would to "You wait loh, we will come in a few days time". We have 2 to 3 deliveries per week and this is causing much frustration.