ha I got the call 2 days after they turned up. They didn't want any paperwork, just a couple of photos and a look at my passport. I think their just verifying your actually staying where you say you are
You can find that immigration offices ask you to also show them what you supplied to the embassy to get the income affidavit/certificate so you can't wing that. However if your mother can show she has an income of 65k baht per month equivalent in France that should be fine
yes, seems to be coming normal. I had one this year in Sa Kaeo shortly after my 7th extension based on retirement. But the extension was not dependant on the visit, it had already been issued. Normally they call and ask if it's a convenient time
It's not that complex, particularly if you have the funds in the bank and can show they came from overseas. You need 10 to 15 days left on your stamp depending on where you are. But their reticence and the fact you already have a condo makes me wonder about your history inside Thailand?