Rusted Honda Amaze 2020 model

I bought a new Honda Amaze in 2020 at canal walk Honda. In 2022 the car started rusting. I was advised to take it to Claremont. Then given the run around. After nearly a year of nobody getting back to me I message Honda sa. They then advised they cannot honor the paintwork warranty because the car does not have a service history with Honda but my car has a full service history with a registered rmi workshop.