My magsafe charger just broke my phones battery?

My phone died one day so I used my MagSafe charger and it wouldn’t charge my phone at all. I went home to change my phone and none of my chargers worked, I tried 5. It eventually worked but I’m having issues. My phone is basically unusable without a charger around and it’d be a miracle if it even charged. Just now I took my phone off the charger and left it off in my pocket to go downstairs, by the time I came upstairs it was dead, didn’t take it out of my pocket, left my room with it at 31%. What do I do? This charger that’s literally meant for an apple phone broke my phone.