Which immigration office should I visit for a tourist visa extension in Thailand?

UPDATE from MTT, we did have several people who entered on a 60 day tourist visa or a 45 day visa exempt entry stamp go to MTT and ask for the 60 day covid extension rather than the regular 30 day extension. Three were told earlier last week they couldn't do it and had to get the 30 day regular extension FIRST and then if covid extensions were still available after that ran down they could apply

BUT

This week a couple people were told "okay you can apply for the covid extension BUT it will start from the date you apply" (meaning you lose any time you have left on your current stamp) and you will get a 2 week under consideration stamp and have to come back to get the 60 day extension

OR

you can get the 30 day extension now and see what's what when that runs out