Shocking after sales service from CellC

Three weeks ago I received a phone call from a CellC call centre agent. My daughter's cell phone was due for an upgrade and I agreed to it. With the upgrade came a new cell phone device. As usual the sales agent was very energetic and helpful. I then explicitly told him that the delivery of the device should be at my residential address, which is also the registered residential address at CellC. A week later the delivery company phoned me, telling me that they went to my work address and that no one was there to receive it. I then explained to the delivery company that CellC made a mistake as they indicated the incorrect delivery address on the parcel. I then immediately emailed Cellc and has followed it up with numerous correspondence. However, they just ignored all my communication and keep giving me new case numbers. It's an extremely frustrating process and I still haven't received the device as yet.

And then this morning I received another email from them, giving me a new case number, requesting me to phone the call centre. That's after I communicated to them the problem AND correct delivery address on emails, numerous times. Shocking service !!

WHY CAN'T CELLC HAVE THE SAME ENERGY WITH THE AFTER SALES SERVICE THAN WHAT THEY SHOW DURING THE SALES PROCESS?????

Please help !!!