I was shocked to know the result of one of the campaign. This is Sponsored Display, created last May 26, as I checked the spending was already $500 in just one day on June 1?!!?, and the daily budget of the campaign is only $10. How is that possible?
As I create the campaign last May 26, there is only minimal traction recorded on that day, and no traction recorded between May 27 to 31. Is this a glitch on Amazon end?
I am sorry to hear that you are experiencing issues with PPC exceeding your budget. Is this your first time using Sponsored Products? A similar thing happened to me as well.
It seems to me that someone must have clicked multiple times on your advertised products and the spend should be corrected after a few days. Try calling the Seller Support to see if they can give you some insight into what exactly happened.