Charged for company factory fault

Bought a set of pots in 2024 July,when I opened the set after 7 days of delivery I noted the smallest one that it's lid does not close properly Then I told my agent/ person I signed to,on WhatsApp with the picture She promised to come back to me after she rrprt to her manager I've waited for her til to date I've made followup 2weeks back on their WhatsApp business account and showed them the picture again They called me after 3 days saying they can change the lid IF I pay R500 of exchanging My question was Hiw can I pay for their factory fault,suppose they check for quality before delivering I feel I'm being ****** here or taken chance Please help me