Cellphone upgrade

Went to the iStore about three weeks ago to upgrade our contracts. Filled in all the paperwork, selected a plan and Bernice Mohale sent everything to head office. Credit check was done and two weeks later we still heard nothing. Phone the iStore to follow up, only to hear that head office could not continue as there was a change in price of the plan we opted for. Spoke to Nico at the iStore that said we need not fill in new paperwork, we must select a plan and he will give it to head office to process. Opted for a new plan and he assured me he would immediately send it through to be processed. Went to the iStore today to follow up on the status of the upgrade, only to hear that Nico did not give through the info to head office. Phoned head office from the iStore to ask how long it will take for the upgrade if they receive the info today. They say they don't give feedback, the iStore does. iStore says they don't give feedback, head office does. Nobody takes responsibility to sort this out. Cancelled the upgrade immediately. Seeing that iStore is a company that does not respond, they obviously don't care either. Worst service ever!!!!!