Dhl International
Call centre not calling back or putting effort

I have phoned DHL countless times trying to organise my shipment to be ordered and everytime I speak to the call agents They say they will phone my client and organise finer details. they have not phoned my customer once or me to tell me there is a problem. I would like my customer to recieve his custom reciept so he can pay and everyone can be happy.he cant pay if he is not contacted or given notification.
Regards,
Matthew van Niekerk.