Due to your developers customization, we are in no way responsible for the errors that had caused while your developer was customizing, the product comes as is, any customization done is entirely up to you and your developer. Unfortunately with the refund, you won't be able to use our theme. We will only give you a refund if you decide not to use our product anymore. As we can see you have installed EasyAjaxProblem, which is most likely causing the problems to happen on IE6 and IE7, this has nothing to do with us as you have installed a 3rd party script that may or may not work with out themes.
Let us know.