Twitter stopped working for me last week, now I can't reverify my phone... why?

I have not received any tweets on my phone since last Thursday, and the tweets I sent from my phone never hit my account. I tried to reset my mobile over the weekend, and texted the verify code, but never received a confirmation text in reply. I have tried to delete my mobile and start over about 4 times now and still the same.

I have sent 2 requests for help to Twitter but have received no reply. Has this happened to anyone else? Can anyone help me?