how to remove payment method at checkout page

hello sir

i try to delete payment method at checkout page :

1. remove at module done but still appear
2. install / unsintall done but still appear
3. remove file at language/english/payment done but still appear option at payment method

please help me how to remove it , i think its done by some one who need to steal information

opencart Version 2.0.3.1

Thanks yo0u

What about if you disable all payment methods?
After that nothing should be displayed, instead some message like 'No payment methods available ..'