BBERRYNEWS

I know this has been done to death but I have tried everything suggested (I think) and still have not found a solution to my problem. My 8900 is BB unlocked and used on vodafone uk network on a BB data contract. I have had it since April and am still getting used to it, I have very few additional apps running on it. Four days ago it switched itself off and when I switched it back on the screen was frozen. I have tried to reset by removing the battery, when I do this I leave the battery out for 2 hours or more, I get a red light (message light) in the top right hand corner and the screen goes white with a small timer in the middle, after about 3 mins the home page comes up, the screen remains frozen and it fades to a black screen within 2 mins. I cannot do the ctrl, alt, delete reset as the keyboard is not responsive. If I plug in the charger the clock appears but I can’t get the home menu to come up. If I leave it alone the phone switches itself on and off with no prompting. Sometimes I can move the tracker ball but not open the full menu, the contacts page will then open without being selected and the screen will fill with hlhlhlhlhl, without any keys being touched! The the voice activated dailing command with start without any prompting or the phone being touched. I am starting to become really frustrated with it. I should just return it to the place I bought it from, however the seller is being a bit of an idiot about it and says they won’t replace it. I have checked with trading standards in the uk and they legally have to, but I know they could just mess me around if I sent it back so am trying to get them to agree to change it before sending it back to them. It was bought on eBay, brand new and sealed from a registered uk business seller. Hope I haven’t missed out anything important or given too much info, thanks in advance