Not being there, one can't say for sure, but I'm about 99.9% certain you're getting screwed.
When they change the first hose they should have pulled a vacuum for about a half-hour before putting in the freon, etc. That would have disclosed the O-ring leak.
It may well be your compressor is bad, but just don't go back there to find out & get the work done -- ask around and find another repair facility.
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