WARRANTY ISSUES

Good day

I am very disappointed with Renault as i have been servicing my car on time but now they are declining my warranty claim. When i was doing my 45000km service renault clearwater did not stamp my service book and i only saw it when i went for my 60000km service. The 45000km was then stamped after the 60000km then i thought my problems were over. Sometime in 2018 i had mechanical problems with my car which i took to the clearwater branch and they fixed it, saying i need to pay a certain percentage on the claim due to a late service ....i paid that money and went home and looked for all my invoices . All my services were done on time and the late service that they were talking about, was the mistake that they did with my service book . They then promised to refund me, i kept calling and going back for my refund and i was still promised that they will get back to me and this was early 2018 i am still waiting for that refund till this day. Fast-forward to now, my car is showing a heartbeat warning light ....i towed it to Renault East Rand now they are telling me that warranty will not cover my car due to the fact that i bumped a gate back in 2017. Now why did warranty pay when i had the mechanical issues in 2018???? because that was after i bumped the gate, they never said anything about my car being bumped.