Unfair treatment and blatant theft

I am highly dissatisfied with the treatment received by the claims department at Auto and General. Nevermind the inconvenience caused by them. On 04 July 2018 i was involved in an accident which was not my fault. I had stopped at a traffic light and a taxi smashed into me from behind and thereby causing me to go into the car in front of me. I then received a hired car on the same day which I have as an add on my policy to have use of a car for 30 days should I be involved in an accident. Also so that I don't have to be inconvenienced because of being involved I an accident. Anyway I recieved the hired car and was to take it back on 03 August 2018 which is when my 30 days expires. All of a sudden on 12 July I receive a message to say the car must go back on 13 July 2018 to which I then called the claims department to find out what is happening. They then informed that my claimed was finalized on the 10th already but no one has called me and this now being the 12th when I am calling them,i get told this... Anyway,they informed me of what all i have to submit to them so that i can be paid out. My problem with that is I do not have the registration papers which is still with the bank and will take 5 to 7 working days to get it. I have arranged for this on the very same day,12 July 2018 and informed them to which they only gave me 6 normal days extension on the hired car,which means that should I received the registration papers on the 7th working day I will be without a car for a few days... even though I am paying for a hired car and to have it for 30 days I will now get inconvenienced by my insurance. Whereas I feel they should pay me out first and then expect the hired car back. Not the other way around when I haven't even had the car for 30 days. There is no way that I will want to stay on with an insurance who treats a paying customer like this... I get to pay for 30 days car hire but they only want to give it to me for 15 days. How can that equation even make sense to them?