defy 621 rust

Bought a 621 Defy stove from pick n pay hyper in May. My plates began to rust. I also notice rust on the warmer draw and bottom conner. Contacted pick n pay in July took them two week to send out a tech. The defy tech that came out to view the stove left saying his senior tech will have a look. Well that was another two weeks. Waited for another two weeks for the the senior tech to come out . His response was he will change the only the plates I explained I have waited nearly 4 weeks for any help,he said to speak to management of pick n pay to do the refund. I have been going back n forth with fone calls and visit to the store.speaking to the manger of appliance at pick n pay. It's goner be 3 months and haven't received any help from from pick n pay in returning my stove.spoke to the manger on Sunday still wating for his call.