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In my days as a Gold advertiser, I contacted yahoo search marketing and asked them to investigate what I believed to be a large amount of "unusual click activity" coming from one source. After their investigation, they granted me a substantial refund based on the information I'd provided.
Months later, after I had decresed my spending on yahoo to the point where I was no longer a gold advertiser, I noticed the same "unusual click activity" coming from the same source...basically a complete duplicate of my original claim. I called ysm again, and again they launched a lengthy investigation.
They sent me a form email denying my claim and making statements about my account setup that showed that whoever was responsible for the email had never actually been inside my account. I called up and asked what the heck was going on and was told the email was sent in error, and to check my email the next day. Next day, no email. I call back, now it's a different story from my account rep, who transfers me to their click fraud team, who gives me yet another story. I'm then told to pull my raw logs and send them in. I have my programmer pull them and I call to ask where to email or upload them to and am then told that they have no use for my web logs.
The entire process was a joke, and is why I now keep my dealings (and spending) with YSM to a minimum.
This approach did not work for me. I figured I was owed about $700 dollars in bogus clicks.
All my hits in one category came from (NYCGROUP hosted URLs) per the whois database.
The subject category is, "WAS" costing average .65 cents per hit.
The gold team/fraud dept offered me $7 dollars.
I'm waiting for good old yahoo to give me a URL blocking tool since I'm still unable to opt out of this nycgroup of bogus sites killing my budget since May 2006...
Was it May 2006 that MSN parted ways with Yahoo/Overture?
IMO, credits are usually deemed neccessary when you are a respectable & valued client. Otherwise, the amount of the credit then becomes the determining factor based on my experience.
Definitely audit your PPC monthly or bi-monthly & aggregate all your invalid or suspicious clicks. Anything over $1,000 & Yahoo will take you very seriously.
Hope that helps!
I sure wish Y! would filter Tor/proxy traffic, and stop this nonsense on the front-end!
Good luck.