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Rear pads on VWs always wear faster than the fronts, you can ask for longer wear brakes but they will be noisier. Or you can get softer pads that will wear faster. It looks like you live in a "rust belt" state, if you don't keep your car in a garage you will get condensation on the rotors and corrosion will form, and you will get a scraping sound every morning for the first few times you stop.
The grooves look like you may have gotten some gravel/sand in the pad area, they normally do not wear like that. I'm sure you weren't "due" for a replacement, you probably had plenty of pad life left, they just offered to sell you pads and rotors to get you back to ungrooved, non noisy brakes. You can always say no to suggested repairs.