Charged for device I never received and RAIN continues to invoice me

If I could give a negative amount of stars I would. I have been dealing with the same issue for over a month. I ordered a device and I DID NOT RECEIVE IT. In September I was invoiced and charged R1,391.50. I called and disputed the amount and was told I would be refunded never happened, called back, and same story and not refunded. Called the third time and was told the amount was credited and instead of being refunded and was promised it will be refunded. The most recent call was on 18th October. And still do not have my refund. I called today and was told there is a collection request, please explain to me how there is a collection request for a device that was not delivered. I decided to log into the account and I found that yesterday I was invoiced R759.00 after explaining to 3 different people that I did not receive the device. The amount of frustration I have with this is unbelievably high. To make a single call I need to have over 30 minutes of free time and to have to do this multiple time for a single issue is unbelievable.