Don't ask we don't honor our guarantee

In September 2018 I was rear ended and after a long wait (supplier issue) my car was repaired in December 2018 After about two weeks I noticed that the paint on my bumper was peeling In January 2019 I returned to DALS Montague Gardens to inform them of the peeling as there is a lifetime guarantee on paint work (or so I was told ) After going through the whole experience of having my car repaired and driving a rental (out of pocket) car I requested a courtesy car as the issue was not of my doing but bad workmanship (DALS needs to carry any cost) I was told at the time that there were only 3 cars as the others were sold and it could take anything from 2 weeks to 4 months before I could get a car I was happy with that I have mailed 5 months later to get an update (no reply received) It is going on 10 months now and still have not heard from anyone regarding the fixing of my bumper I would be more than happy to cover the cost of a rental if this was not a guarantee issue but it is and I don't see the logic in making a client pay for a mess that was created by poor / rushed work that offers a lifetime guarantee