About half a year ago, I had a laptop serviced for...

About half a year ago, I had a laptop serviced for repair. The service diagnosed damage to the motherboard and I didn't look inside, because there was no point in repairing it. However, I looked inside yesterday and it turned out that one 4GB RAM RAM disappeared! Before returning to service, there were 4 GB in two slots, and now one slot is EMPTY. I do not recommend !