Microfiber sofa pilling and grainy?

Does microfiber start to turn rough and pill? I've had a microfiber sofa for about a month and its starting to feel grainy and pill like a sweater would, I can't imagine what it will look and feel like 6 months from now. I spoke to the store and they say they can change the fabric but will not guarantee it won't just happen again. Is this normal or did the store sell me something that is not really microfiber. The label says the covering is 100% polyester, is that what all microfiber sofas say? The showroom sofa was nice and soft not like mine at all. I was sold a microfiber sofa and I have a feeling its really not. Can someone please let me know if its is normal for this to happen before I goes nuts on the store, like I said I've only had then sofa for a month. Thanks.