Not willing to extend the vehicle hire period

Good day I am very upset right now with Dial Direct - Telesure, I have a BUSINESS insurance policy with them. My vehicle was in an accident on 24/11/2017. On 28/11/2017 the rental vehicle was delivered to me. I received a call on the 01/12/17 from the insurance consultant to say the vehicle will be repaired by Renew It – Greenstone and they will be in contact. I got a follow up call from the repairer yesterday (06/12/2017), they advised me that the vehicle repair will take +- 3-4 working weeks as they need to re- assess the vehicle for unseen damages, if there is additional damages they will need authorization from the insurance and if there is no additional damage then they will go head to order the parts for the repair. I called the Telesure today (07/12/2017) to advise them on what the repairer has informed me and that I will need the vehicle hire to be extended as I need a vehicle because this is our busy time at work and I can’t be without a vehicle. The repair consultant informs me that they will not extended the vehicle hire as I am only covered for 15days. When I said to the consultant that they took almost a week to get the vehicle assess he says to me their time period to attend to the claim is 8-10days, so please tell me if your TIME PERIOD is between 8-10days for a claim how can the car hire only be 15days? The consultant says he can put me through to Eurocar where I can hire a vehicle from them at a reduced rental!!!! I pay my insurance every month and a vehicle hire options is inclusive in my policy but now I get told they can’t extend the vehicle hire and I must foot the bill until my vehicle is repaired? PLEASE TELL ME WHY DO I PAY A VEHICLE HIRE PREMIUM EVERY MONTH TO NOW BE TOLD THEY CAN’T EXTEND THE VEHICLE HIRE? I am running a business hence the reason for having Business Insurance and need a vehicle to conduct my work therefore the reason why I took the vehicle hire option on my policy!