New Samsung Galaxy A12

My husband's IPhone just quit working one day and he was told he just needed to replace it. It was not even 3 years old. Since he didn't use it much and just wanted a cell phone because, let's face it, there are no public phones anymore (what a scam!) he decided to go with very basic and, 6 months ago, got the Galaxy A-12, which has always been VERY slow, no matter what he tries to do. We went to 2 different stores, which is always a waste of time...The phone is so slow that 80% of the time he needs to return calls because he simply cannot  answer the call🙄  As if this isn't bad enough, not only is he not eligible to trade up for something better, everyone at T-Mobile wants him to buy much pricier cell phones. Sure, that'll happen.. 👎 I've just about had it with their poor customer service...