Texts Won't Send!!! (Telus)?

When I try to send a text, I often get a message that it 'failed to send'. I have a signal and everything and if I stand in exactly the same place I can send it a little later. I phoned Telus about it and she said there was a block (I have no idea what that means) and she removed it. Then today (two days after that happened), my phone is back to how it was.

What could this be? Should I phone them again? I have dropped my phone...uh...enough times that you can tell it's been dropped and it's been acting kinda funny lately (turning off when I don't want it to). Could this be what is causing it?

contact customer service