Midea microwave/convection oven

Bought a Midea micro and convection oven June 2020 at P&P Hyper Faerie Glen. Stainless steel interior started to rust. Took back but was returned weeks later and advised if it rusts further then they will replace..inside rusted more..phoned the agent numerous times..was advised I will receive a call to arrange a replacement..no call..been months now with a rusted oven inside..still under guarentee and warrenty...pathetic service. Will never buy a Midea product ever. Still waiting for the product to be replaced after months!!