Those attempts didn't happened from our company directly.
We have over 7000 active clients for various services, from shared hosting to large dedicated server systems.
Even if some of our clients tried to attack your site as you claim, you should report it, and it would be resolved.
Beside that, there is big chance that someone hacked into our client vps/server and put Malicious content.
Anyway,
Email us over follow email: abuse@as51430.net
or over following form: http://www.altushost.com/report-abuse.html
Your issue will be resolved.