It really depends on the type of sites you are working with, and whether you've optimised your ad zone placement. At least contact them (help-at-exoclick.com) they can give you advice/clarity for sure.
First, I can't believe that their Customer Service team are not able to help you, are you contacting them at their help email address.
Secondly, I would guess the banners contain something that is not allowed on their guidelines or if you are targeting a specific site then the site doesn't...
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