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It would be unlawful for you to be denied benefits since you are entitled to them. It does not matter that you receive the benefits and then two days later have to have surgery.
An employer can dismiss an employee at any point in time. The law is that if you are dismissed within the first three months of employment you are not entitled to any notice or pay in lieu of notice. If you are dismissed after three months employment then you are entitled to notice or termination pay.
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