How much is quality sacrificed in busier times?

I'm a first time buyer from Kuololit and asked for a stone to be changed from round to OEC on an order I placed. The reply I got after 3 days was 'Sorry we can't, too busy'. Obviously customer service is in the toilet with the sale (or maybe in general, I'm not sure as a first time buyer), but I'm wondering if this is reflected in the quality of the pieces?