Data feed project for Web site

I have a project for someone with experience in using Google merchant data feeds. My site is fairly new and sells nutritional supplements and vitamins. I have over 1,000 products set up on a ZenCart Web site. I set up a Google Merchant data feed using the Magnetic One Zen Cart Data Feed Module. My problem is that Google has suspended my account. I believe because of a few errors in my feed- such as "duplicate items". I would like someone to examine my feed for Google, help me optimize it and get my Google account reactivated. For future projects I will need help with other data feeds, such as [login to view URL], [login to view URL], [login to view URL], etc. And any optimizations that will help my Web site start generating income.