Check that you have sufficient funds available in your payment account to make the deposit. For reasons beyond our control, some card issuers may block transactions to gaming companies. We would advise you to contact your card issuer in this instance.
One of the best ways for many customers to fund their account is through PayPal and that is no different on bet365 with the ease of depositing and withdrawal on the site making it very accessible for betting on a variety of different markets.