Can I deposit money into my Credit card account with cash at the post office?

Hi. today my bank asked me to deposit money into my credit card a/c by CASH at the post office. I didn't notice there's a Bank@post service, what i did was taking the cash directly to the counter, gave them my credit card and scanned my card and paid, didn't fill out any forms. the officer gave me a small receipt showing the transaction. but not the bank@post form.

Can I deposit money in this way? will the money being deposit? the officer didn't tell me anything about the bank@post option.

thanks.