climate issues

New poster here. Seat Leon ST MK3 2014 1.4 138hp petrol I have searched the forums but couldn't find this particular combination. Please post a link if I have missed something. I have the common fault with the climate in my car. From the beginning the interior wasn't warming up until a long way...

The left/right heating sensors get confused and heat one side of the car and freeze the other with the temp is set to the same for left and right. This only happens when the cabin is up to temp (after say, 20 mins or so). Seat said that this was a recall problem on some cars but not mine...