The manufacturer recommended this person and he came and purported an expertise in the area and on his measurements you ( or he?) ordered the doors.
Whoever measured and ordered the doors is responsible, assuming that they were manufactured to the order sizes given. Have you seen the actual order? That will identify who is responsible for the problem!
If the installer took the measurements and made the order with incorrect figures, I don't see how he can deny responsibility. I think what you need is to get a copy of the order, and then you can establish whether the error was in the order, or in the manufacturing.
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