Kampgrounds Of America [KOA] review: Failure to honor advertised pricing

Arrived to the Myrtle Beach KOA; advertised price was $76.30 per night plus tax. When my husband went to check in, he was charged $106/night. I screen shot the price we were expecting to pay and when the desk clerk was questioned about it she stated the pricing on the app is different than if the front desk takes the reservation. Funny thing is, they have availability but you can’t actually follow thru with making a reservation online because the app won’t accept it and directed us to contact the campground directly. (No reason given) Not impressed with a company who does such shady business and won’t even acknowledge a customers dissatisfaction when made known.