Irate Customer

I recently rented a car from Summit Car Hire in Montague Gardens. First off the service was great when arranging everything. I got the quote same day I made the rental fee a month in advance before I needed the car. I was told I needed to pay upfront to secure the car for the period I would need. I did not have a problem with this and I agreed. I then went with my husband to collect the car the Saturday a Chevrolet Aveo and we checked the car with their on site mechanic to make sure everything was in order, we signed the papers and went straight to the Shell garage opposite their business to fill up the car. then we drove on the n1 towards Cape Town and the car started making a rattling sound eventually it stopped. Sunday came and we had to drive the car again before we took the long road low and behold the card starting rattling and shaking and you cant drive more than 60km. I phoned the 24hour emergency number they apologised and the car was replaced with a Ford Figo. I received this car empty as well. Filled this car up again and I was told to keep my receipt for the petrol I put in the Chev and that I would be reimbursed with my deposit. When I returned the car I emailed them proof of payment for the petrol of filling the car, nobody bothered to respond to my email until I phoned to find out what is happening. I did not get a straight answer saying the owner will be in contact with me. Its been two weeks and no feedback. I don't understand how a company can operate and put people lives at risk with the type of cars they rent out. Worse service received and not even a apology nor my deposit or my additional petrol payment received. I would not recommend Summit Car Hire to anybody.