My suggestion would be to start from scratch. Have a vacuum pulled on it and check for leaks first. If it will hold a vacuum at -29 in/hg, have them add 4 oz. of A/C oil due to condenser replacement and receiver/dryer replacement. You do that after you have tested to see if it will hold a vacuum for 30min. If it won't hold a vacuum, get the leaks fixed at the receiver/dryer or A/C lines. Make sure all of the O'rings were replaced with new and oil applied before assembly.
I hate to say it but most tech's these days don't have the brain power to work on the cars of today. When it comes to electronics, they are dumbfounded.
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