Once you have unlocked a Bet Request, you do have the option to Reject the Bet Request. It should be noted that in the event that you reject a Bet Request, it may adversely affect your being sent Bet Requests in the future and will limit your ability to use the betconnect button.
To reject a Bet Request, you need to scroll down to the bottom of the unlocked Bet Request and click on 'Reject Bet Request'.
You will then be prompted to select a reason for rejecting. It should be noted that you can still opt to match the Bet Request by clicking on 'I changed my mind'. However, if you wish to continue and reject the Bet Request, select your reason for rejecting from the dropdown and click on 'Yes, reject this bet'.