Hi Kim;
High chlorine levels didn't 'fry' the seal -- it's ceramic and machined carbon, and neither of those materials are much affected by chlorine. So, your repair guys are playing the CYA -- Cover Your A%% -- game, at least to some degree ("It wasn't us; we didn't put that seal in wrong; it's that pool guy over behind the tree!").
So to start, your pool guy didn't cause the seal to fail. That lands right on the heads of your repair guys (which is why they are doing the CYA dance) -- it may have been a defective seal (which they couldn't have predicted) or it may have been a defective repair (it's quite easy to damage seals when installing them -- they are very fragile)
Also, it's unusual for a bad seal to take down a motor. Those motors are MADE to run outdoors, in the rain. Water running UNDER the motor, from a leaking seal, surely won't HELP the motor, but it wouldn't ordinarily kill it, either. I'm not sure what happened in your case, to cause an "extreme build up of chlorine salts and corrosion under the pump".
As to the question, should your pool guy have noticed? Probably.
Is he RESPONSIBLE for not noticing? I dunno -- what's in the service agreement? We have a steady trickle of pool service guys here who barely know which end of the vacuum pole to grab. They may be able to keep the pool clean, and the chemicals adjusted (following the recipe they got somewhere) but that's about the limit of their knowledge. For obvious reasons, those that know a lot more, tend to be more expensive. It sounds like your guy who "seemed a bit confused about it", was one of those inexpensive service guys who knows just enough to get by.
My best guess? You're stuck.
I'd put my money on the fault being your repair guys . . . but I can't prove it. If it's been less than a year, I'd sure try to stick them with the rebuild + seal, and ask for the replacement motor at their cost.
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