Bad customer service and bridge of contract

I recently had a car accident and was unfortunate to be covered by Discovery. After seeing on the website that my car repairs were only due after my curtesy car rental expired I tried calling Discovery and the consultant told me that the matter will be escalated and that her manager will phone me back. I never received a call from Discovery even though I phoned 6 more times and only hanging up after being put on hold for more than 10 minutes every time. Twelve o'clock on the day my curtesy car expired I received a sms from Discovery notifying me that my repairs were done and my car was ready for collection. When I arrived at the panel beater two hours later my car was still far from ready and after waiting another hour I had to take my half-repaired car. I tried phoning Discovery again only to be put on hold again and I hung up after 20 minutes. Since receiving my car I've tried numerous times to phone Discovery only to be put on hold for more than 20 minutes before hanging up. I've sent 2 mails to the complaints department, only receiving an automated response. It's been 5 days since my first e-mail and I still haven't received any response