I am from Canada and this is my problem... I purchased a comforter set, which doesn't fit on my bed. Mattress is too high. I have an RMA Number, and have tried to return it via Fed Ex. The won't take the box as they say the zip code I have is not valid. Have called customer service and was assured this is the correct zip code. How do I return this to you? It was shipped out to me from Burnaby B. C. Can I return it there for full credit on the items?