Yes, you can. The couriers make contact on the cellphone number provided.

If you are unavailable, please notify the courier of your expected availability to receive the delivery.

Deliveries are not time-based; if the courier arrives at the given address without someone to receive the delivery, they will contact you and attempt a second delivery. 

If the second delivery fails, the order is returned to the Tarsus Distribution Johannesburg branch, and a credit will be processed.  

Rejection or failed deliveries may be charged for again.