It sounds like you're trying to express a range of contrasting sentiments regarding customer feedback on your product and the sales goals you didn’t meet. Here’s a refined version of your statement using appropriate conjunctions and transitions:
"When we reviewed our sales numbers, we learned that we did not meet all our goals despite our hard work. Furthermore, it appears that customers don't seem to enjoy our product. Although we put in significant effort, the results indicate that we may need to reevaluate our strategy."
Feel free to adjust any part of the statement depending on specific details you'd like to emphasize!