Failure to replace damaged parts, bad customer service

I replaced my wipers in November 2019 at Renault Table View , then January 2020 when it rained, they were not clearing the windscreen, I then contacted them,and because my service was due soon I opted to replace then when I take car for service, when I eventually took it in, they didn't have wipers in store, a week later it rained I called them and they said they have them in store, I then went there and I was told to pay over R600 for wipers and labor aswell, I refused that since I believe it's manufacturing error, I contacted head office, I was told they have 1year guarantee on their stuff, then they said they gonna resolve... After almost a month, whereby some emails where ignored, I got a reply that the claim has been declined I have to pay for them, and they can only offer free labor... Is or really possible to replace wipers in less than two months, where you spend over R600. This is sad, and the people there are rude and don't really give you attention, I will never in my life buy another Renault, they don't appreciate us, and just wanna take any money possible from customers.