MAKRO - Bad servicee

We bought a outdoor dining set in September2017. 1st April 2018 detected rust. We contacted Makro who then contacted their supplier. This supplier inspected and confirmed rust in chair legs Makro will not replace as they say their supplier will not replace or credit because the outdoor set should have been protected with covers This we were not told this by Makro when the purchase was made. We did not expect it to be covered as the patio set was advertised as outdoor . They are trying to make there problem with the supplier my problem. Do not buy from Makro