Is the shifter really broken? My high shifter isn't shifting in gears 1-4 (5-8 are fine). I took it to a shop and they said I need a new shifter because it's in "really bad shape". No details or anything. Does it seem like they're pulling a fast one on me?

Thanks.
Normally, a shop will not lie on their customers, as they do want you to come back again. But if you don't know whether to trust them or not, you can try to show your bike to another shop.