Discovery Bank Money *****!

i was a Discovery Credit Card holder and an FNB client however i decided to cancel my Discovery Credit Card when they decided to move across on their own. i would have assumed that the account and card would have been full and completely cancel upon my submission of the cancellation documents. During the month of February i deposited cash into my Credit Card from an FNB ATM with my FNB card but the money some reason went into a Discovery account that does not exist. i contacted Discovery Bank to started the process of recovering my money from them. Discovery Bank has acknowledged receiving my money but is giving me a complete run around to pay back MY MONEY! Today is the 14/04/2020 they have yet to pay back my money and every time i call them. they have a new excuse.