Breastfeeding baby refusing bottle

Hello ladies, I need advice and tips. My daughter is 6 months old, I have try to give her bottle since she was 4 months but she refused. I was EBF and since she was 4 months I have been trying to give her milk but with no success. Now that she is 6 months she still refuse d bottle, d milk and d baby food I just started giving her. She is constantly crying for breast. I can't leave her with anyone coz she will cry n cry. And d fact that she can't take her bottle make it hard to leave her with someone. I will soon return to work so I need to make sure she start bottle feed. What can I do to make her start taking her bottle. Any advice or suggestions will be appreciated. Thanks