Twitter worked with my phone at first and then just stopped...

I only recently created a twitter account, and when I did I immediately verified my phone to receive/send tweets. At first it worked perfectly but then about 24 hours later I stopped recieving tweets and every time I tried to update my own tweets they would not update. I tried to delete and re-verify my phone but it isn't receiving my verification text (which i have sent AT LEAST 5 TIMES IN THE LAST 12 HOURS). This is really frustrating... what can I do?!