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I think when you go in there its important to do some prep about what you are going to say. Some things I've learned over the years about getting what you want in customer service situations:
First off, ask for the manager right off the bat, no one but him is going to be able to do anything about this whatsoever, so you are wasting your breathe to talk to a tech or anyone else.
Identify what the official policy is about tuning, or in this case basegrinding and tuning.
Identify how they didn't ahere to the policy. (does every k2 that comes through their shop get the rivets ground off? I doubt it) Also stress how these rivets are not just cosmetic, (even though the kind of are) that this one is now not doing its job because its got belt sanded off by a neglegent tech.
Make sure that you stress how they didn't live up to your expectations. Even though you skied on them for a day it should be clear if the edges have been recently tuned, and if a full basegrind was done. Any unfilled baseshots will be more arguable because they could say you did that skiing on them. Maybe don't say you skied on them yet or just don't bring it up unless they ask.
Finally you need to clearly identify what you want. I think replacing your skis in this situation would be kind of extreme, its not like its a huge deal, but I would expect something in the neighborhood of an apology and like 100 dollar gift card type of thing.
Its important that you don't get sucked into arguing with whoever you are dealing with over small details. If the shop manager is giving you attitude just stick to things like, "I would expect better from this shop.'' andd stuff like that. Stay calm, stay respectful, but don't cave. If you are young it might be a good idea to bring your dad or older sibling or something.
good luck man
The revivals do not have removable tip rivets. Its not an issue of performance, its more about principle. If he wanted to have a fucked up tune he would have done it himself for free. Instead he paid for a professional job and got less than a professional outcome. Beyond that, its up to OP and the shop manager to negotiate a fair agreement, but he's definitely owed something.