Regardless of the reason your account was restricted, the only way to get out of this restriction zone is by contacting bet365's customer support. Even if you have no idea why your account has been restricted, you should still contact customer support to get an idea so you can open it back.

To reset your password, enter your Username in the 'Having trouble logging in? ' form and select Next. Then enter your details in the 'Send Me A Reset Code' form and select 'Get a Reset Code' to receive a unique six-digit code by email or SMS.