I am sorry to hear that, you are right. Sometimes the examiner doesn’t look into the evidence properly.
Once you get refused at the first application , you need to declare all the points they have mentioned in the paper. Otherwise will be refused over and over again.
I recommended that group because all the members are UKs wife so they might share their experiences with you how they made it.
Yesterday went to Muang tong they couldn't do covid extension. The officer said we have to go to Immigration change Wattana,,, so we went they and got extension. Very easy
Pre-approval took 30min, then the approval you suppose to get it in 3-4 working days, something might be wrong with your docs if it takes longer than that.