Find a good independent mechanic. This place is a rip-off. Fuel Injectors cleaner service is a sure sign. Unless your car was running very rough and didn’t accelerate well then your injectors are probably fine.
AS for the tranny fluid. It may be a special type of filter by Kia…That doesn’t mean you have to buy it from the Kia dealer. There’s probably an equivalent out there by some oil company…check around.