Worst service/ products and lies

My mother was contacted by a rep for home choice. They offered her a deal for a laptop and over the phone they advised she will be paying it over 16 months. My mom then agrees to it because it seemed like a good deal. She was waiting for it until the lockdown level lifted. Finally the laptop arrived not 1 but 2 which was one that she also had cancelled. All in all I decided I would take 1 and she would have 1. She takes out the slip from her box a few days later and notices that just for 1 it went from 16 month to paying it off over 36 months and that is not what we agreed to. The laptop I have does not last more than an hour while it's not charging. When we told the agent at home choice , the response was oh well we dont take back second hand stuff. I am not happy that we were **** to when it came to the part of how long you would be paying it off over and the fact that the laptop batter won't last long. I cant believe a company like them does not care about customer service or the fact that they lie to get their customers to agree to their products.