I forgot my security question

I really don't know what to do right now. In addition to that, i'm in process of completing 2 jobs but i am unable to raise an invoice as the last time i tried to link a bank account to my account it was rejected. It was rejected because it said that the credit card name has to be under my own and not my mom's but the thing is I don't have my own credit card at this moment. Kindly let me know how to proceed