כן, אני בדרך כלל בוחנת את המוצר היטב לפני שאני קונה בחנות.

You can return it even if u used it as long as it is within the amount of days that is on the receipt they will accept returns and either give ur money or a more suitable product. Mac products are terrible for your skin and you should try to avoid this place at all costs. You can be investing your hard earned money (and your beauty) with a company with actual ethics and morals.
Go to Artofskincare.com and go to the makeup section and check out their all natural products. They have a very good selection of some of the best brands of makeup that aren't so popular, but are wayyyy better for your skin. Good luck

I have only needed to make one return and customer service was great. They use UPS. So I had to wait for them to email me a return label, which took a few days. Then I repackaged the items and brought the box to a UPS pick up and MAC refunded my card within days.