Poor Customer Service

I bought a cellphone on contract on the 17th of Nov. Phone got delivered on the 26th of Nov. Tried switching it on and charging but no luck. Returned the phone on the 27th of Nov to Vodacom Repairs in Vincent park. They said it's an OBF and took it back and said would contact me soon. Today, 4th Dec I received an SMS that said the OBF device has been processed and a replacement device is ready for collection. I go there immediately and to my surprise, there's no device to be collected. The lady at the counter tells me that her manager still has to send emails for the store to be credited. The lady said all of that will be done on Monday. Furthermore, they now say the device is out of stock. My issue is, why did they send communication for me to collect a replacement device in the first place, if it was not available. Wasted my time and fuel for nothing. I'm so disappointed in Vodacom!