Bad Service and Booking Error

Hi. A month or 2 ago i had an inquiry about a booking error on the website. The consultant was friendly and changed my booing. This morning i changed my flight to match that of my wife. I paid the change fees. When i booked my wife's flights the calendar defaulted to FEB. I changed my flights and was positive that the calendar was in FEB. However there was a popup about some changes already in a basket. After payment i received the new flight details and it was for 22/3 and 25/3 instead of 22/2 and 25/2. When i called the contact center to correct this they go on about additional 100 + 300 change fee + difference in flight cost. The agents come across with a no care attitude and are fairly useless. The supervisor was even worst and sounded like a robot on flat batteries. I've been booking flights every single month for the past 6 months now and never had any issues. *** is happening to your airline and the service.