<prompt> Human: Like I said in the title, my father opened a credit card with me as a cosigner when I was 13. Over the last year, he brought it to its limit then defaulted. My credit score went from 730 to 610 fica and is dropping. I had him take me off of the account, but can I still contest it because I did not consent to being on it?Edit- I was an authorized user, not a cosigner. I apologize for the mixup, I just learned that it is a big one.  <response>: As you were younger than 18 when the account was open you absolutely should contest responsibility as you cant enter a contract at that age. 