Inefficient service by Hollard Insurance

I am writing to report Holland insurance on their inefficiency and inadequacy in dealing with consumers. Around the 5th of September 2023 I took my car in (Mercedes Benz C class model) in for accident repairs at Ray Giese body shop. (Recommended by Hollard insurance) On the 28th of September, the work on the car was completed with the exception of the installation of the sensors - they say that they are awaiting authorisation from Holland insurance to install the sensors. Since then, multiple letters have been sent to Hollard for this issue and they have been unresponsive everywhere - they are not answering calls, emails or messages. Europcar, which is the company I am using for the courtesy car, have been calling me and I had to return the car today because it is past the 30 day mark that I was given.

The inefficiency of Hollard is affecting my life in a very negative way because I now do not currently have a car, whereas I pay my monthly insurance instalments timeously every month. I am now reaching out to you to ask for you help in dealing with this matter.