DecorMania.eu review for Google & YouTube

Trying to configure this app for ages. I'm having the same problems in my two stores, I have so many products disapproved with missing GTIN or EAN numbers and I had to mark every single one in Google Merchants manually as a custom product. Also, my G Merchant is not pulling out the correct feed information and I have constant problems with products being disproved. It's a nightmare to work with, lack of support and both Shopify and Google blame each other and I'm the one who is losing here! this is so frustrating!