REFUSAL TO HELP!!

I was involved in an accident on the 4th of August and registered my claim immediately with Standard Insurance Limited. I was given a rental car and told that the rental period will expire on the 4th of September. However my claim was only approved on the 21st of August. This is especially annoying seeing as repairs on my car will only be completed on the 15th of September. When I called my insurance to ask for an extension on my rental Ridwaan Adams refused to help me. I don't think that this is fair because the delay was on their side, not mine. Now I will be without a car for two weeks.