[iLinx]

if your hosting it from your computer, then your home line is your problem
most home connections dont have a static upload/download speed and they vary depending on user hours

if your not then you should contact your host / rangeban the attacker off your server or if you have a root server, you could try rangebanning the person by putting his ip address into your iptables / other firewall system, depending on your os

Most people have dynamic ip's , but you can safley block the last numbers of the ip, ex
127.0.0.*
127.0.*.*

if you have his ip's stored a couple of times, i would look carefully at the ip's and compare them, try to find a common range, and ban that range.
like if the first time he came and his ip was
127.0.0.182
and then the second time it was
127.0.0.62
i would rangeban 127.0.0.*

im using local host as an example though, his/her's ip address will be much different

sorry if that was completly useless lolol