Bonuses are subject to play through requirements. This just means you cannot immediately withdraw a bonus, but have to bet it a certain amount of times at certain odds before you are eligible to withdraw.
How do I know what the playthrough requirements are?
Each promotion is accompanied by a set of Terms and Conditions that are available on the Bet.co.za website. Please familiarise yourself with the terms before accepting the bonus. If you have any queries regarding your requirements, please contact Customer Support for assistance.