Can not log to Cpanel and Putty.org

Dear Sir,

Can not log to Cpanel and Putty.org

The Desk is full,should be only about 25%, may be too many duplicated back up file or spam. The site also down.
I tried to log to putty.org,looks hard to type password and too many time try so now I can not log to
Putty.org.

I want to delete some duplicated back up file first.
but shell access not avaliable

What I should do.

Thanks!