Bad Customer Service - Passing the Buck

I was involved in a smash and grab incident in May and my tablet was taken.Luckily I had insurance on the device. I submitted the claim ad it was approved within 3 days. On the 27th Masy I received an sms that my device has been dispatched to Centurion Mall branch and thry will contact me for collection. I never received any call from anyone. I went to the branch on the 01st June and I found the branch closed due to relocation. This week they reopened and I went to the branch on 10th June and the feedback I was given by Melissa was that they have not received the device yet and they will call me when they have it. I asked how long does it take as I have already received the sms. I had to ask them to contact the courier company and enquire and they said I must call them myself. They only contacted a lady by the name of Sue who works ast the shop but she denied having received the device. Melissa promised to call me back today. I left very disappoited and I decided to contact te courier company myself, I spoke to Quintin who confirmed to me that the device was delivered to enturion on the 28th May and it was signed off by Sue who denied having received it. Frustrated right now.