If you can't get into a channel, then there will be a message indicating why you can't get in. This message will be sent to your status window.
Without that message, there's simply too many possibilities to go through them all here.
You say you can send, but not get. This sounds like you're sharing files, and wanting to get files that others are sharing, in which case this sticky applies.
If you can't get because you haven't got voice, then you are neither kicked nor banned from the channel.

The issuance of voice status (or any other level in a channel) is completely at the discretion of the ops of the channel. There is nothing we can do to help you obtain the status that you're wanting if the ops in the channel won't give it to you.