Definitely call them and check to see what they want....It's possible that they did credit you the payment, but maybe they want you to send them paper copies of your 2018 CA tax return.
What might have happened is that you e-filed CA tax forms, but sent them a payment check by mail for what you owed, but you never looked back at your account to make sure your CA tax return was really accepted....if your CA tax return was rejected, then they got your money, but none of the detailed CA paperwork. Either that or you selected CA to file by mail, but didn't realize that YOU have to print out the CA forms and mail them in yourself....
..or maybe they credited the payment to the wrong year?
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
