In line with previous replies I'd ask if you could post a picture of your air conditioning..
Bit of extra info would help troubleshoot the problem as there's quite a couple of different components in airconditioning that can fail with different 'levels' of failure as a result
Did it blow ice cold air and suddenly stopped working altogether? Or maybe it is cold(ish) while driving but when the engine drops to idle it goes warm?
When you got it regassed, did they do a pressure test? Why did you have it regassed? How long was it since the previous regas? Did it work before the regas? Did they tell you how much gas was left in the system prior to top up?
'It's failed' is almost as difficult to assess on a forum as 'the car is making a noise, is that normal?'