Acoount payments

I opened a credit card. They send me the stement. I made a mayment on 26 September 2023. They are keep on sending emails and SMS telling me I'm late with payment. After I sended my proof of payment to approximately 6 different email and I called in. Now they want to charge me a fee because I'm late. This is really bad. I would not recommen this credit card to any one. I hope I get feedback now because I'm still struggling