Faulty Cellphone

I bought a cellphone at Game Wonderpark on Monday, 04/11/2024. When I charged it on Monday it Indicated that it will take 2hrs to be full. To my surprise it took 7hr to get full. I called the store to inform them of the problem and they told me the phone must bqe booked in for assessment. A brand new phone? I do not agree with this! How can a new phone be booked for assessment? I told them I want refund or exchange, the guy I spoke to told me its Impossible. I use the cellphone for exams, now they tell me they must book a phone. This is *******, I want my money back so I buy another phone. I am not allowing Game to cost me my exams.