Yet another faulty product from Hifi Corporation

I bought a brand new Nokia C1 for my mother about four months ago. This week the SD card reader failed. I have attempted to contact hi-fi corporation via email as I am currently in Hong Kong but have received no response from them at all. My mother is an aged woman who cannot sort out her technological problems herself and having her new phone break on her in a matter of months is disappointing and dangerous. I believed that the days of hifi corporation selling faulty grey stock were over but clearly I was wrong. I would like a full refund or a replacement phone of a different make or model. But perhaps that's wishful thinking?