Reporting abuse to ISP that goes nowhere

Apologies for the operational content. =) I've been working with a client who has been the victim of several SQL injection attacks. These attacks are being used to insert links to malicious javascript hosted elsewhere using the following domains: seekcc.com google9.info any-park.cn I've reported the abuse several times to the abuse contact listed by ARIN, but it seems to simply be a blackhole at Verizon Business (their address space). How have others handled this problem? Also, if there is a more appropriate forum for this question and forthcoming discussion, please let me know. Thanks! -brandon