ac compressor

Had my ac compressor replaced, took it back 15 days later because it was dual ac and the rear wasnt working after being replaced. Mr didnt realize it was
dual and said it needed expansion valve, didnt have any problems for next 3 months. Then started to use ac this summer - compressor locked. Is it possible that the system wasnt flushed correctly due to full repair not being completed at the same time and debris got into compressor? The 15 days could that have been enough time to send debris through the system?
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