Been fobbed off loads with this phone

I have been back to bluewater about my phone 5times due to faults. I had sim stuck in my 1st replacement then I had no silent mode on the 2nd and the 3rd phone I was dropping calls and the home button sticking. This still happens. I then went back after Xmas with the same fault and was told there is no fault and this was just software issues. I then asked how long my warranty was left and that I was not happy with this and they said not long about 2weeks I think this is now up. But I have had problems from day 1. I was told by a manager that the iPhone 4 was rubbish and now old and can't cope with the work load, I stated that the phone was less than 2months old and I had no problems with the original until I dropped it and smashed the screen. I have also since had a problem with the camera not working correctly. And now I have noticed that the sound does not work on text tone. And the vibration also doesn't work. So I am getting txt then not realising. I have to travel 30miles there and back every time I take my phone into the shop to get told this is software, I think this is an excuse to not sort the problem. I need to bring this phone back because of sound. If you could please get back to me on this it would be great. Lloyd