They can give you exactly what you need. They are extraordinarily helpful when it comes to government services outside Thailand. Inside Thailand same as everywhere else in the world poor pay and overworked. Except they smile about it.
Thai baht a month and can prove it shouldn't be an issue. The whole thing with Visas is Thailand wants you to be self supporting and not take a Thai job. Hence the required cash on arrival for exempt entry. The METV solves that.