Telkom system mistakes keeps clients waiting

Hi there, I received a call from Telkom to collect 2x tablets on the 18th November. Bare in mind that my first application was done on the 10th October and I have ran into several problems with their system and still haven't received the phone. The sales person told me to fetch the tablets at 1pm on the 18th. So went thinking that the long waiting period is finally over. I get there, the sales person brings out the tablets. and as he is processing the final documents, he tells me that theres a problem with the system cause it duplicated 1 of the tabs and because of this I have to wait again for the back office to rectify the problem. MY question is this, why are there mistakes like this, why call me everytime to fetch the phones then leave me with nothing but stress. The last issue with Telkom vangate mall took about 2weeks to resolve. and I fear waiting so long again. some how someone isn't doing their job properly cause that is a sign of bad service. at least check if everything is right before u contact the client.