If you don’t attend work on time, if you leave work early, or if you are rude to customers or your manager, or you don’t do your work as directed, if you do not achieve the targets set your employer can dismiss you.
Your employer has the ability to dismiss you, as long as they follow proper procedures and provide you with sufficient notice. They should provide you with a warning, preferably in writing, outlining what their concerns are and provide you with a chance to rectify the problem before dismissing you. This may also require the employer to provide you with additional training. If the situation doesn’t improve you may be dismissed.
You may be entitled to payment for notice of termination (if you are told to leave work straight away), and any remaining annual leave entitlements should be paid out to you on your final pay.