Effort to deliver a service

What terrible service!!! So my account was billed incorrectly and created stories back and forth. Finally I had the account sorted out and balanced. I paid the account monthly and no further problems. I wanted to upgrade last week, going to Vodacom Oakfields the lady said she had to put some kind of request through to upgrade, she will have everything sorted by the end of the week. We'll no phone call was received during the week so I go through to Eastgate mall Vodacom to follow up, only to find the Oakfields branch never logged the request. Sofie at Eastgate logged the request and promised feedback with in 3 hrs, surprise surprise no call. I then called in to follow up. Sofie wasn't available so I left a message - no call back. Phoned the call center, spoke to Vusi there who had the audacity to sigh when I asked him to check for me what the current status of the request was!! Don't understand how a simple upgrade could be this difficult. Will cancel and rather go to a service provider who wants to provide a SERVICE