terrible service

I have now waited just over 3 weeks for my upgrade to arrive due to terrible service. Not only do you not note important dates brought to your attention when I upgraded, i.e. that I will not be home for delivery for a certain period and you send the goods out anyway, you then cancel my upgrade and I have to follow up weeks later and go through the whole process. Today you tried to deliver to the (half)correct address via courier but again had captured another contact number and only half the address causing the delivery to be delayed yet AGAIN!! What on earth is wrong here? this is lower grade operations and admin surely? capturing a correct detail such as an address and not having your courier call my mothers number in another city? pls explain! I had JUST decided to stay with Vodacom and not move to another supplier but wow this reminds me why I was strongly considering moving to another service provider. Extremely frustrating!