WIZZ Air review: unfair charge / money return request

Hi, I would like to request a refund and make a complaint. I don't normally fly with your airlines (and after this experience I will not do so ever again).
I have booked a flight GD8D6T for my family (my husband and my 7month old baby) for our Christmas trip. On the outbound flight we checked in online some time in advance and chose random sit allocation since I have no preference as to where we were going to be seated. We of course had a booking together and you knew we travel with a baby that is less than one year old, we were checking in early so I didn't see the problem. Unfortunately your system purposefully allocated me apart from my husband and a baby. When we boarded the plane we realised that I was allocated a seat far from my 7month old baby that I breast feed. I have back problems and can not hold my baby for longer periods of time, it is my husbands responsibility therefore baby had to be with him. I would understand allocating our sits separately if the flight was full and there was no sits available unfortunately as we noticed after the boarding the aircraft was not even close to be full. There was plenty of free sits and we could have been seated together without any problem. Luckly a polite staff found a way for me and my 7 month old baby and husband to be together during 3h long flight. The problem was our return flight. Since now we already learned that your airline exploits clients this time we decided to PAY an unfair charge to be seated together with my 7 months old baby and my husband. We tried to check in via your app as we usually do with all low fare airlines and the only option we received to check it was if we buy the seats but the only sits we could chose from were the emergency exit seats WHERE YOU CAN NOT SIT WITH A BABY. We tried again... and again the only way we could check in online was if we chose and PAY for the emergency exit seats. So as every normal person that flies dozen of times a year (my husband works for TV so he takes over 100 flights every year) we decided that since we can not book online we will do so at the airport. Unfortunately at the airport we were told that we need to pay 320zł for checking in and 50zł for no idea what. After running around to payment office with a baby and back to the check in desk we were told that we still can not sit together! And another staff member at the check in desk commented that '' that this app sometimes doesn't work properly''. After boarding the aircraft I managed to swap seats with other passenger so I could actually be with my baby and feed her during the 3h flight. After the take off we realised that there was a free seat beside us, so I could have been easily seated with my baby from the very beginning (starting with an app and then staff at the airport). So everything was done 100% deliberately just so we pay extra charges! I would like to request a refund of 320zł plus 50zł and I would also like to cancel my membership / club card with your airline and request a refund of that charge as well as I do not wish to fly with Wizzair ever again. Please find scans and photos attached.

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