Unifi bill payment account is different from Telekom or Streamyx payment account.
There are 2 places in the Internet where you can make payment to your Unifi HSBB bills with your credit card.
If you have a Maybank credit card, you can login to Maybank2u, go to Bill Payment section and make a payment to the payee named as "Telekom Malaysia Berhad - Unifi". Of course, you can also pay with your balance in your Maybank account there.
Another place in the Internet to make payment to your Unifi HSBB bills with your credit card is in the My Unifi Online Customer Centre - http://occ.unifi.my.
After login to MyUnifi OCC, go to the MyBill tab, you will see a blue "Make Payment" button at the bottom of the page.
There is a trick here. Before you click on the "Make Payment" button, you need to set your web browser to allow for pop-up within occ.unifi.my as the payment form is a pop-up page.
After clicking on "Make Payment" button, this is what you will see. You can then make payment with any of your credit cards there.
Note that your credit card information will be sent via secured HTTPS channel.