good luck!

You need to ask for a refund. They sold you a locked phone, and a master unlock code is near-impossible to get out of Samsung

So RAM and storage are upgradable. If you can save money by finding a lower RAM and storage spec machine with other features, I would do that.

You’re gonna regret buying a 5-8lb laptop for student usage. Buy something in the thin and light category, and also don’t worry about high refresh rate. Maybe look at the Acer Swift 3 OLED