@Korosh0 You can't get a star rating changed, or a review removed unless it violates Airbnb review policy, so don't waste your time with customer service.
Your overall rating isn't an average of the category ratings. The guests gave you a 4* Overall rating.
And guests will give whatever star rating they choose- it won't necessarily make sense to you. Value is one that is often marked down. Seems like guests would almost always prefer that they had paid less, no matter how reasonable your price is. 🙂