Endless Issues

I had an issue with my LG G2 which, 10 days out of warranty, started playing up. The graphics would consistently jump up and down on the phone. I went to the store as they were recommended for having a service counter, explained the problem and asked for a quote. I was told R1.6k - which I agreed on, advised that it was not the screen itself, as the crack that was there happened after the jumping, and told them not to replace this. <br> <br> This was replaced, I was called in, and hey ho - same issues. Took it back, advised, showed a video clip of what the phone did, Asked them to test repeatedly, download apps ans run the phone into the ground if they had to. Apparently they did, I went to collect, and within half a day, it was back to its old tricks. i took it back, AGAIN, asked for a refund and was told that they had to put the old damaged screen on, which I was fine with, as I said to them, the screen was not the issue! <br> I went back to collect, and they had lost my phone. 4 days later it was found, but they informed me that the screen put on had a crack running across it - far worse than my original screen. <br> 2 days later - and nothing. I am at my wits end!