This Facebook group was created to give you all the support you need. We help each other, and it's better than any self-proclaimed professional visa agent. I read so deeply here that I ended up checking everything five times word for word, letter for letter with my own visa application. But typos aren't everything. It gets funny with "place of issue," for example. Without the help here in the Facebook group, I certainly could have applied for the visa three times.
You said that it was rejected without explanation, but the explanation is that the expiration date of the passport does not match the expiration date in the visa application. There is no chance of getting the money back, that's what happened to many people.
If you're going there, I recommend staying at the hotel directly across from the consulate. If you're invited to the interview or need to go to the consulate to check on the status of your visa application, you can simply cross the street and avoid having to deal with greedy taxi drivers.
There will be an interview in Vientiane and Savannakhet, so most people avoid Laos. If all your documents are authentic and you can verify the amount in your banking app on your phone, then you have nothing to worry
You can usually find the visa processing time on the consulate's website. It's often 10-15 working days. Think of Songkran, when no one worked and many probably took bridging days. They probably have a backlog to work through.
Ok, I'm just trying to understand why the visa consular officer is taking so long. He might have some suspicion that something's wrong with you. The new passport seems to have caught his attention. I hope you get your approval soon.