FeedHub: Google Shopping Feed

When choosing a program, we focus on the functionality and quality of technical support. When choosing this program (an alternative to Google channel by Shopify), I counted on additional fields and very high-quality technical support, despite the fact that it is inconvenient to work in an outside program.
At first:
- the responses were very quick
- many promises to refine and improve
There was a lot of hope.
In fact:
- fields are very often transmitted incorrectly. We have to check / look for an error in the shopfy, and in their program, and in the merchant center.
- synchronization with the merchant center every 3 hours. This is unacceptable if you regularly run promotions. The price display on the website and in the merchant center does not correspond to 3 hours or more (+ processing time). And time and clicks are your money that you lose.
- you have to wait weeks for answers
- I have not received a response to the request for the correctness of uninstalling the program ...