Unprofessional *********** manager at the grove mall

What a horrible experience at the grove mugg and bean. I've never seen a very unprofessional and *********** manager, instead of solving the issue he start to blame the waitress that she's a trainee, because he was protecting his horrible behaviour towards us. I asked the waiter to show me which drink I can buy using vitality qr code voucher. The waitress went and finds out for me since she didn't have any knowledge. She came back and said I can buy any drink except bottomless. I redeem my voucher and I order a green smoothie. Immediately after putting an order they told me no I can only order cappuccino. I told them but you said I can but any drink except bottomless. They said sorry we will talk to our manager. The waiter came and told me the manager said no, meaning they can't give me a cold drink, I can only order cappuccino. Firstly before I redeem the voucher I asked them which drinks I can buy with the voucher. 2nd they gave wrong information yet they refused to correct their mistake. I asked to see the manager.*********** and unprofessional manager who sounds bias. Horrible service I'll never set my foot there. I hate poor service and felt as if you doing me a favour yet it was the restaurant mistake. Thanks to the waitress who was very professional and she handled everything so professional. Actually the waitress was ready to buy me a drink that I want but I refuse as it wasn't her mistake. The information that they gave her was wrong. Mr Manager please change your attitude, and be professional.Solve rge problem and don't blame the waitress, instead you are the one who sound like a trainee. The waitress was so professional, you can learn from the staff.