Worst Customer Service ever and they owe me money

They don't deserve any stars but the review does not allow me to give them a negative star rating.

So I ordered a home wifi mesh system in the begining of June 2020. They delivered the package in time but I realised that it was the wrong device so I let them know and they came to collect the device in a couple of days time. They assured me that they will deliver the correct device as soon as they have logged the return device. A week passed and I never heard from them so the nightmare started. So I followed-up once a week and no one could tell me what the status of the order was. So after a month and couple of weeks I was able to speak to one of the managers in the fibre to the home technical department his name is Francois. Francois managed to find some information and called me to say that they don't have stock of the device but as soon as the stock arrives they will treat my order as a priority. It is almost two months now and I have not had any update about the status of the order. I phoned Francois last week Friday again and asked that he calls me back and today is Tuesday and I have not heard back from Francois. Since the start of this ordeal I called vox around 20 times and each time they promised to look into the matter and they will call me back with an update of the 20 times only Francois called back that one time. To make matters worst while all this is going on and I have no device Vox billed me for the devices so on one of the calls I queried this and they logged a ticket with the accounts department that was going to credit my account to date I have not heard from the Vox accounts department. So my original ticket was allocated to Thando in the fox fibre to the home technical department and I have not heard from Thando since our initial discussion in early June, everytime she/he is busy on a call and will call me back today is 28 July and I have not ever heard from Thando. The manager francois is well aware of my frustrations with this but he is clearly not to bothered anymore, I have received the worst service from the following Vox staff members in the Vox Fibre to the home technical department, Thando, Francois, Ettiene and Lionel. Today I called again and talked to Lerato from the same department and she was a breath of fresh air she was enthusiastic and promised to look into the matter nad provide me with an update during the course of the day she was gonna get in tough with Thando who was busy on a call again and try to understand what is going on and she also promised to get in touch with other deprartments to get to the bottom of this and provide me with some sort of update. This ordeal is draining me out and is really frustrating this is the worst serivce I have ever received from any company in South Africa. They really are the worst but in Lionel's words they are a really big company with a lot of departments and I I kind of agree as it is very clear in their service they are so big they cannot control the way they treat their customers it is evident in my weekly follow-up calls to the Vox call centre, they just don't care.

The ticket number for my query with Thando is VOX***1 and my tixket number with the accounts department is VOX12****36