Well I am sad to say, if you did not use an OEM or charger with the same voltage you probably fried your laptop. Your system board will need to be replaced and more than likely your SSD if it was fried. If you have enough money it is cheaper to replace it entirely than to pay someone to replace the entire board.
If its under warranty bring it to Apple, if not more than likely if its completely fried, unfortunantly if your motherboard is fried due to a voltage issue your SSD is probably not salvageable due to the nature of how it stores information. Compared to a traditional HDD which stores your information as sectors on a magnetic platter, while an SSD stores your information randomly as bites on each individual chip - as a SSD runs as a chiplet with multiple chips storing your information, if the SSD has failed 100% that information is not salvageable without professional support through clean rooms, which require special equipment. Because your computer is a macbook they all come with the newer M.2 MVME ssd’s (as far as I am aware) that run hot and have a relatively high failure rate if not cooled properly
So, what I use is get yourself a 16 gig USB and install Linux Ubuntu and run it on the USB as a trial version and pull the data, or if push comes to shove put Puppy Linux on your USB and pull the data manually while running your SSD through an external, or just get an external and pull your data through your new computer. You can get a external housing relatively cheap now a days.