Right, so do nothing about it at all that will solve it.
If this is a really DDOS attack, which I very highly doubt, it will be quite simple to close the ports they are attacking, and close access to the IP's they are using. Whether or not they can switch them, it's just a simple matter of blocking ip's until they give up, or simply close the vulnerable ports. So, unless you have actual help to offer, stop spamming.