poor quality

The shop poorly kept records, they made me go back and forth, without informing me that they don't have the paper that contains the description of how faulty the phone is, which I returned to them 3 months ago. My assumption is that it has software problem since the LCD flashes on/off, but after they made enquiry to what I believe to be their repairer, they said the phone is physically damaged and there's extra payment I need to do because LCD is broken. I had to give them my copy of description that contains phone details which puzzled me, it took me 3 months to realize that myself and the shop don't talk about the same phone which I bought from them. Worst part is I got this disturbing responce after I've been going back and fourth and lots of empty promises.