Fauly microwave

I bought a microwave from clicks, the entire inside is rusting and it cannot be used, i took the microwave in and was turned away as i was a month to late with guarantee????i asked if it could be sent in and repaired and was told no, surely a month or two later considered should be given esp for microwaves thats rusting and its a year old, thanks clicks i will never buy appliances from you again????????????