This is a public space so you have now given spammers your name and phone number, so a good way along the path to having enough info to steal your identity. Please edit your post to remove your personal info.
This community does not have the access to personal accounts to answer your question, so I suggest that you contact customer services on 333.
If your first bill is not what you expected then this can be caused by a number of things from a slightly extended billing cycle, a one-off payment for your phone, insurance or some other service that you may have inadvertently agreed to.
