Lack of delivery what was promised.

I am afraid I have to write about Discovery Insure poor customer service. My vehicle had undergone repairs and I required a rental vehicle for the period 11-26 November 2019. Under my policy I qualify for a rental vehicle which was delivered through AVIS. The difficulty I am experiencing is that I required the rental vehicle for one more day as the auto repair shop had some final work to complete. I contacted Discovery as they made all the arrangements with AVIS and they confirmed all is well it is still within the arranged period. The following morning I collected my vehicle from the auto repairers and left the AVIS vehicle there it was just 07:45 when I left their premises. I am now being billed for not delivering the AVIS vehicle on time even though I have made all necessary calls to inform Discovery. I even contacted AVIS the very same day to inform the rental vehicle is at the auto repairers. I am now being penalised for something which was out of my control I am being charged R498.28 under contract Number E-*** . I contacted Discovery offices again on the 30 December 2019 at 08:24 on which they confirmed this will be refunded as this is due to no fault of my own. I am sure if they track my mobile number on their system they will be able to locate all the relevant telephone calls

This has been dragging on since 2019 with no one from the customer service team assisting me at all.