Unprofessional and poor customer centric

I was involved in an accident a few weeks ago and was allocated a courtesy car where the insurance informed me that I needed to return the rented car on the 23 August 2019. A week passed and o was informed that my my car was written off. I had to constantly call the insurance company to enquire on the status and progress of the claim. I even further requested them to kindly call me should the matter be urgent however during my last few days when the claim was being finalized, 21 August 2019 just before I left the office at 17:00, called to enquire on the possibilities of an extension date since I haven’t gotten a replacement car. To my dismay, a rude consultant harshly reprimanded me to return the car at 21 August 2019 before 10am, mind you even after indicating to them that I am currently out of the province and also indicated that the agreed date was the 23 August as that was the day I preplanned to return home. I’m now being harassed with SMS’s from iwyze to enquire on the return of the car.
1.Can I also get clarity on whether or not am I not eligible to a full 30 day car hire?
2. When was I going to be informed that I needed to return the car prior to the agreed date of the 23 August had I not called to enquire
3. Is this the level of customer service at which the company treats its so called valued clients
4. Are your employees well trained to give provide the service levels appointed to them
I’m utterly disgusted by the service levels as the divisions do not want to take accountability of this this nonsense they have created. And please do not call me with your pathetic apology unless it involves a proper resolution to this issue