Disgusting Customer Service

I am shocked at the disgusting customer service that I received from Cell C. I have been with Cellc for 10+ years and this is shocking. I did an upgrade on the 14th June via cell c direct, I followup up on Wednesday the 23rd to be told that the device I ordered is out of stock. I could not believe that cell could not pick up the phone to inform me of this. I had to call them to find this out. I changed the device on the same day, and today the 25th I am told that my change was not captured on the system. The agent had no idea what I was talking about. I asked to speak to her manager and she said the manager is not available. As am writing this, she has no idea which device I changed to. Wow, unbelievable.