Ebates Scam Internet

I made several purchases using ebates. Every purchase where the cashback was under $5 went through. I used various coupon codes on these purchases. The purchasE I made that would entitle me to Over $30 cash back did not register. I contacted customer service and after a month of run around answers, it came back that I was unable to obtain my cashback bc I used I coupon code. I was told that the other purchases that I made using coupon codes was mistakenly not picked up by the computer. Coincidence that it's a large cash back and it will not go through? I don't think so. I will no longer continue to use ebates. Terrible customer service. Scammers. Beware.